diff --git a/internal/db/db.go b/internal/db/db.go
index c7d96a8..6749d0c 100644
--- a/internal/db/db.go
+++ b/internal/db/db.go
@@ -336,6 +336,15 @@ func runMigrations(d *sql.DB) error {
 		// URL link previews now post the page's og:image/twitter:image
 		// thumbnail; cache it alongside the title/description.
 		`ALTER TABLE url_cache ADD COLUMN image_url TEXT NOT NULL DEFAULT ''`,
+		// Tempering (gogobee_engagement_plan.md B1). A magic item's rarity
+		// lives on its registry definition, so an upgraded instance needs
+		// somewhere of its own to record how far it has been pushed. temper
+		// counts rarity steps above the definition's base; effective rarity
+		// is derived at the effect/render/sell boundary, never written back.
+		// DEFAULT 0 is the correct value for every pre-existing row, so this
+		// needs no bootstrap backfill.
+		`ALTER TABLE adventure_inventory ADD COLUMN temper INTEGER NOT NULL DEFAULT 0`,
+		`ALTER TABLE magic_item_equipped ADD COLUMN temper INTEGER NOT NULL DEFAULT 0`,
 	}
 	for _, stmt := range columnMigrations {
 		if _, err := d.Exec(stmt); err != nil {
@@ -1500,6 +1509,21 @@ CREATE TABLE IF NOT EXISTS arena_stats (
 	updated_at          INTEGER NOT NULL
 );
 
+-- Arena seasons (gogobee_engagement_plan.md C4). Season standings are DERIVED
+-- from arena_history.created_at, so arena_stats stays lifetime and no
+-- quarterly wipe ever runs. Only the awarded titles are archived here, one row
+-- per (season, kind) — the champion for that quarter, frozen.
+CREATE TABLE IF NOT EXISTS arena_season_titles (
+	season     TEXT NOT NULL,
+	kind       TEXT NOT NULL,          -- 'earnings' | 'streak'
+	user_id    TEXT NOT NULL,
+	value      INTEGER NOT NULL,
+	awarded_at INTEGER NOT NULL,
+	PRIMARY KEY (season, kind)
+);
+CREATE INDEX IF NOT EXISTS idx_arena_season_titles_user ON arena_season_titles(user_id);
+CREATE INDEX IF NOT EXISTS idx_arena_history_created ON arena_history(created_at);
+
 -- Rival System
 CREATE TABLE IF NOT EXISTS adventure_rival_records (
 	user_id      TEXT NOT NULL,
diff --git a/internal/plugin/achievements.go b/internal/plugin/achievements.go
index f8434f1..99a298f 100644
--- a/internal/plugin/achievements.go
+++ b/internal/plugin/achievements.go
@@ -2,6 +2,7 @@ package plugin
 
 import (
 	"database/sql"
+	"encoding/json"
 	"fmt"
 	"log/slog"
 	"strings"
@@ -1137,9 +1138,160 @@ func (p *AchievementsPlugin) buildAchievements() []achievementDef {
 				return false
 			},
 		},
+
+		// ── Expeditions ──
+		// All passive: they read the expedition rows the extract path already
+		// writes. Tier comes from the zone registry, not a column, so the
+		// checks map zone_id → Tier in Go.
+		{
+			ID: "expedition_clear_t1", Name: "Off the Porch", Description: "Cleared your first Tier 1 zone. It only gets worse from here.",
+			Emoji: "🗺️",
+			Check: func(d *sql.DB, u id.UserID) bool { return clearedAnyZoneOfTier(d, u, 1) },
+		},
+		{
+			ID: "expedition_clear_t2", Name: "Reasonably Lost", Description: "Cleared a Tier 2 zone. The map stops being a suggestion.",
+			Emoji: "🗺️",
+			Check: func(d *sql.DB, u id.UserID) bool { return clearedAnyZoneOfTier(d, u, 2) },
+		},
+		{
+			ID: "expedition_clear_t3", Name: "Deep Enough", Description: "Cleared a Tier 3 zone. Someone should have stopped you.",
+			Emoji: "🗺️",
+			Check: func(d *sql.DB, u id.UserID) bool { return clearedAnyZoneOfTier(d, u, 3) },
+		},
+		{
+			ID: "expedition_clear_t4", Name: "Past the Warnings", Description: "Cleared a Tier 4 zone. The signs were quite clear.",
+			Emoji: "🗺️",
+			Check: func(d *sql.DB, u id.UserID) bool { return clearedAnyZoneOfTier(d, u, 4) },
+		},
+		{
+			ID: "expedition_clear_t5", Name: "Where the Map Ends", Description: "Cleared a Tier 5 zone. There was nothing left to be brave about.",
+			Emoji: "🗺️",
+			Check: func(d *sql.DB, u id.UserID) bool { return clearedAnyZoneOfTier(d, u, 5) },
+		},
+		{
+			ID: "expedition_master_t1", Name: "Warren Cartography", Description: "Cleared every Tier 1 zone. Thorough.",
+			Emoji: "🧭",
+			Check: func(d *sql.DB, u id.UserID) bool { return clearedEveryZoneOfTier(d, u, 1) },
+		},
+		{
+			ID: "expedition_master_t2", Name: "No Stone Unturned", Description: "Cleared every Tier 2 zone.",
+			Emoji: "🧭",
+			Check: func(d *sql.DB, u id.UserID) bool { return clearedEveryZoneOfTier(d, u, 2) },
+		},
+		{
+			ID: "expedition_master_t3", Name: "Completionist's Limp", Description: "Cleared every Tier 3 zone. Walk it off.",
+			Emoji: "🧭",
+			Check: func(d *sql.DB, u id.UserID) bool { return clearedEveryZoneOfTier(d, u, 3) },
+		},
+		{
+			ID: "expedition_master_t4", Name: "Nowhere Left to Go Wrong", Description: "Cleared every Tier 4 zone.",
+			Emoji: "🧭",
+			Check: func(d *sql.DB, u id.UserID) bool { return clearedEveryZoneOfTier(d, u, 4) },
+		},
+		{
+			ID: "expedition_master_t5", Name: "The Long Way Down", Description: "Cleared every Tier 5 zone. Both of them. All the way.",
+			Emoji: "🧭",
+			Check: func(d *sql.DB, u id.UserID) bool { return clearedEveryZoneOfTier(d, u, 5) },
+		},
+		{
+			ID: "expedition_quiet_clear", Name: "Nobody Saw Anything", Description: "Cleared a zone without threat ever passing 50. You were never here.",
+			Emoji: "🌑",
+			Check: clearedUnderThreat50,
+		},
+		{
+			ID: "temper_legendary", Name: "Hot Enough", Description: "Tempered an item all the way to Legendary. The blacksmith needed a moment.",
+			Emoji: "🔨",
+			Check: func(d *sql.DB, u id.UserID) bool {
+				// Granted by the temper path on reaching Legendary
+				return false
+			},
+		},
 	}
 }
 
+// ── Expedition achievement helpers ──────────────────────────────────────────
+
+// clearedZoneIDs returns the zones this player has beaten outright. Boss-
+// defeated gates out extractions that merely ended in 'complete'.
+func clearedZoneIDs(d *sql.DB, userID id.UserID) map[ZoneID]bool {
+	out := map[ZoneID]bool{}
+	rows, err := d.Query(
+		`SELECT DISTINCT zone_id FROM dnd_expedition
+		 WHERE user_id = ? AND status = ? AND boss_defeated = 1`,
+		string(userID), ExpeditionStatusComplete)
+	if err != nil {
+		return out
+	}
+	defer rows.Close()
+	for rows.Next() {
+		var z string
+		if err := rows.Scan(&z); err != nil {
+			return out
+		}
+		out[ZoneID(z)] = true
+	}
+	return out
+}
+
+func clearedAnyZoneOfTier(d *sql.DB, userID id.UserID, tier ZoneTier) bool {
+	cleared := clearedZoneIDs(d, userID)
+	for zid := range cleared {
+		if z, ok := getZone(zid); ok && z.Tier == tier {
+			return true
+		}
+	}
+	return false
+}
+
+func clearedEveryZoneOfTier(d *sql.DB, userID id.UserID, tier ZoneTier) bool {
+	cleared := clearedZoneIDs(d, userID)
+	seen := 0
+	for _, z := range allZones() {
+		if z.Tier != tier {
+			continue
+		}
+		if !cleared[z.ID] {
+			return false
+		}
+		seen++
+	}
+	return seen > 0
+}
+
+// clearedUnderThreat50 looks for a cleared expedition whose peak threat never
+// crossed 50 — the same max_threat_seen sample the Patient Zero milestone
+// reads, so the two reward the same play.
+//
+// The key's *presence* is required, not just a low value. recordMaxThreat only
+// samples on day rollover and never stores a zero, so an absent key means the
+// expedition has no threat history at all (a same-day clear) — which is not
+// evidence that threat stayed low.
+func clearedUnderThreat50(d *sql.DB, userID id.UserID) bool {
+	rows, err := d.Query(
+		`SELECT region_state FROM dnd_expedition
+		 WHERE user_id = ? AND status = ? AND boss_defeated = 1`,
+		string(userID), ExpeditionStatusComplete)
+	if err != nil {
+		return false
+	}
+	defer rows.Close()
+	for rows.Next() {
+		var raw string
+		if err := rows.Scan(&raw); err != nil {
+			return false
+		}
+		var state map[string]any
+		if json.Unmarshal([]byte(raw), &state) != nil {
+			continue
+		}
+		peak, ok := state[regionStateMaxThreatKey].(float64)
+		if ok && int(peak) < 50 {
+			return true
+		}
+	}
+	return false
+}
+
 // statGTE checks if a user_stats column is >= threshold.
 var allowedStatColumns = map[string]bool{
 	"total_messages":     true,
diff --git a/internal/plugin/achievements_expedition_test.go b/internal/plugin/achievements_expedition_test.go
new file mode 100644
index 0000000..aafd685
--- /dev/null
+++ b/internal/plugin/achievements_expedition_test.go
@@ -0,0 +1,184 @@
+package plugin
+
+import (
+	"fmt"
+	"testing"
+
+	"gogobee/internal/db"
+
+	"maunium.net/go/mautrix/id"
+)
+
+// expeditionRowSeq gives each synthetic row a unique primary key; two rows can
+// otherwise differ only in boss_defeated.
+var expeditionRowSeq int
+
+// insertClearedExpedition writes an expedition row directly. status and
+// boss_defeated are the two gates the achievement checks read.
+func insertClearedExpedition(t *testing.T, user id.UserID, zoneID ZoneID, status string, bossDefeated int, regionState string) {
+	t.Helper()
+	expeditionRowSeq++
+	_, err := db.Get().Exec(
+		`INSERT INTO dnd_expedition (expedition_id, user_id, zone_id, status, boss_defeated, region_state)
+		 VALUES (?, ?, ?, ?, ?, ?)`,
+		fmt.Sprintf("exp-%d", expeditionRowSeq), string(user), string(zoneID), status, bossDefeated, regionState)
+	if err != nil {
+		t.Fatal(err)
+	}
+}
+
+// zonesOfTier lists the zone ids at a tier, straight from the registry, so the
+// test tracks content edits instead of hardcoding a zone roster.
+func zonesOfTier(tier ZoneTier) []ZoneID {
+	var out []ZoneID
+	for _, z := range allZones() {
+		if z.Tier == tier {
+			out = append(out, z.ID)
+		}
+	}
+	return out
+}
+
+func newAchievementTestDB(t *testing.T) {
+	t.Helper()
+	dir := t.TempDir()
+	db.Close()
+	if err := db.Init(dir); err != nil {
+		t.Fatal(err)
+	}
+	t.Cleanup(db.Close)
+}
+
+func TestExpeditionClearAchievements(t *testing.T) {
+	newAchievementTestDB(t)
+	d := db.Get()
+	user := id.UserID("@clears:test.invalid")
+
+	t1 := zonesOfTier(1)
+	if len(t1) < 2 {
+		t.Skipf("tier 1 has %d zones; test wants at least 2", len(t1))
+	}
+
+	if clearedAnyZoneOfTier(d, user, 1) {
+		t.Error("clean slate reported a tier-1 clear")
+	}
+
+	// A boss-defeated complete run is the only thing that counts.
+	insertClearedExpedition(t, user, t1[0], ExpeditionStatusComplete, 1, "{}")
+	if !clearedAnyZoneOfTier(d, user, 1) {
+		t.Error("cleared tier-1 zone not detected")
+	}
+	if clearedEveryZoneOfTier(d, user, 1) {
+		t.Error("one of several tier-1 zones counted as all of them")
+	}
+	if clearedAnyZoneOfTier(d, user, 2) {
+		t.Error("a tier-1 clear leaked into tier 2")
+	}
+
+	for _, z := range t1[1:] {
+		insertClearedExpedition(t, user, z, ExpeditionStatusComplete, 1, "{}")
+	}
+	if !clearedEveryZoneOfTier(d, user, 1) {
+		t.Error("clearing every tier-1 zone did not satisfy the master check")
+	}
+}
+
+// TestExpeditionClearIgnoresUnfinishedRuns: an abandoned run, or one where the
+// player walked out without killing the boss, must not count as a clear.
+func TestExpeditionClearIgnoresUnfinishedRuns(t *testing.T) {
+	newAchievementTestDB(t)
+	d := db.Get()
+	user := id.UserID("@partial:test.invalid")
+
+	t2 := zonesOfTier(2)
+	if len(t2) == 0 {
+		t.Skip("no tier-2 zones")
+	}
+
+	insertClearedExpedition(t, user, t2[0], ExpeditionStatusAbandoned, 1, "{}")
+	if clearedAnyZoneOfTier(d, user, 2) {
+		t.Error("an abandoned expedition counted as a clear")
+	}
+
+	insertClearedExpedition(t, user, t2[0], ExpeditionStatusComplete, 0, "{}")
+	if clearedAnyZoneOfTier(d, user, 2) {
+		t.Error("a complete run with the boss alive counted as a clear")
+	}
+
+	insertClearedExpedition(t, user, t2[0], ExpeditionStatusComplete, 1, "{}")
+	if !clearedAnyZoneOfTier(d, user, 2) {
+		t.Error("a real clear was not detected")
+	}
+}
+
+// TestClearedUnderThreat50 pins the presence-vs-zero distinction. recordMaxThreat
+// samples only on day rollover and never writes a zero, so an empty region_state
+// means "no threat history", not "threat stayed at zero".
+func TestClearedUnderThreat50(t *testing.T) {
+	newAchievementTestDB(t)
+	d := db.Get()
+
+	zones := zonesOfTier(1)
+	if len(zones) == 0 {
+		t.Skip("no tier-1 zones")
+	}
+	z := zones[0]
+
+	quiet := id.UserID("@quiet:test.invalid")
+	loud := id.UserID("@loud:test.invalid")
+	sameDay := id.UserID("@sameday:test.invalid")
+
+	insertClearedExpedition(t, quiet, z, ExpeditionStatusComplete, 1, `{"max_threat_seen":30}`)
+	if !clearedUnderThreat50(d, quiet) {
+		t.Error("peak threat 30 did not satisfy the under-50 check")
+	}
+
+	insertClearedExpedition(t, loud, z, ExpeditionStatusComplete, 1, `{"max_threat_seen":60}`)
+	if clearedUnderThreat50(d, loud) {
+		t.Error("peak threat 60 satisfied the under-50 check")
+	}
+
+	insertClearedExpedition(t, sameDay, z, ExpeditionStatusComplete, 1, "{}")
+	if clearedUnderThreat50(d, sameDay) {
+		t.Error("an expedition with no threat samples was awarded the quiet clear")
+	}
+
+	// Exactly 50 is not under 50.
+	edge := id.UserID("@edge:test.invalid")
+	insertClearedExpedition(t, edge, z, ExpeditionStatusComplete, 1, `{"max_threat_seen":50}`)
+	if clearedUnderThreat50(d, edge) {
+		t.Error("peak threat of exactly 50 counted as under 50")
+	}
+}
+
+// TestExpeditionAchievementIDsRegistered guards the wiring: every expedition
+// achievement referenced by the tier helpers must exist in the registry, and a
+// tier with no zones must not ship a master achievement nobody can earn.
+func TestExpeditionAchievementIDsRegistered(t *testing.T) {
+	p := &AchievementsPlugin{}
+	defs := p.buildAchievements()
+	ids := map[string]bool{}
+	for _, a := range defs {
+		if ids[a.ID] {
+			t.Errorf("duplicate achievement id %q", a.ID)
+		}
+		ids[a.ID] = true
+	}
+
+	for tier := ZoneTier(1); tier <= 5; tier++ {
+		if len(zonesOfTier(tier)) == 0 {
+			continue
+		}
+		for _, prefix := range []string{"expedition_clear_t", "expedition_master_t"} {
+			id := prefix + string(rune('0'+tier))
+			if !ids[id] {
+				t.Errorf("tier %d has zones but %q is not registered", tier, id)
+			}
+		}
+	}
+	for _, id := range []string{"expedition_quiet_clear", "temper_legendary"} {
+		if !ids[id] {
+			t.Errorf("%q is not registered", id)
+		}
+	}
+}
diff --git a/internal/plugin/adventure.go b/internal/plugin/adventure.go
index ef39778..a149b50 100644
--- a/internal/plugin/adventure.go
+++ b/internal/plugin/adventure.go
@@ -484,6 +484,8 @@ func (p *AdventurePlugin) dispatchCommand(ctx MessageContext) error {
 		return p.handleRepairAllCmd(ctx)
 	case strings.HasPrefix(lower, "repair "):
 		return p.handleRepairSlotCmd(ctx, strings.TrimSpace(args[7:]))
+	case lower == "temper":
+		return p.handleTemperCmd(ctx)
 	case lower == "boost":
 		return p.handleBoostCmd(ctx)
 	case lower == "recipes":
@@ -518,6 +520,7 @@ const advHelpText = `**Adventure Commands**
 ` + "`!adventure blacksmith`" + ` — Visit the blacksmith (view repair costs)
 ` + "`!adventure repair all`" + ` — Repair all damaged equipment
 ` + "`!adventure repair <slot>`" + ` — Repair a specific slot
+` + "`!adventure temper`" + ` — Push a magic item one rarity step higher (blacksmith)
 ` + "`!adventure recipes`" + ` — List crafting recipes known at your current Foraging level
 ` + "`!adventure mastery`" + ` — Per-slot equipment mastery progress and active bonus
 ` + "`!adventure treasures`" + ` — List your treasures · ` + "`treasures lock`" + ` to refuse swaps
@@ -853,6 +856,10 @@ func (p *AdventurePlugin) resolvePendingInteraction(ctx MessageContext, interact
 		return p.resolveBlacksmithSlotChoice(ctx, interaction)
 	case "blacksmith_confirm":
 		return p.resolveBlacksmithConfirm(ctx, interaction)
+	case "temper_pick":
+		return p.resolveTemperPick(ctx, interaction)
+	case "temper_confirm":
+		return p.resolveTemperConfirm(ctx, interaction)
 	case "shop_category":
 		return p.resolveShopCategoryChoice(ctx, interaction)
 	case "shop_item":
diff --git a/internal/plugin/adventure_arena.go b/internal/plugin/adventure_arena.go
index f84a056..c1c5740 100644
--- a/internal/plugin/adventure_arena.go
+++ b/internal/plugin/adventure_arena.go
@@ -304,13 +304,17 @@ func (p *AdventurePlugin) handleArenaStats(ctx MessageContext) error {
 	return p.SendDM(ctx.Sender, renderArenaPersonalStats(displayName, wins, losses, stats))
 }
 
+// handleArenaLeaderboard shows the current season's standings (C4). Lifetime
+// totals stay reachable via `!arena stats`.
 func (p *AdventurePlugin) handleArenaLeaderboard(ctx MessageContext) error {
-	entries, err := loadArenaLeaderboard()
+	now := time.Now().UTC()
+	start, end := arenaSeasonBounds(now)
+	entries, err := loadArenaSeasonLeaderboard(start, end)
 	if err != nil {
-		slog.Error("arena: failed to load leaderboard", "err", err)
+		slog.Error("arena: failed to load season leaderboard", "err", err)
 		return p.SendReply(ctx.RoomID, ctx.EventID, "Failed to load arena leaderboard.")
 	}
-	return p.SendReply(ctx.RoomID, ctx.EventID, renderArenaLeaderboard(entries))
+	return p.SendReply(ctx.RoomID, ctx.EventID, renderArenaLeaderboard(arenaSeasonKey(now), entries))
 }
 
 // ── Combat Resolution ───────────────────────────────────────────────────────
diff --git a/internal/plugin/adventure_arena_render.go b/internal/plugin/adventure_arena_render.go
index a8858a5..08099a6 100644
--- a/internal/plugin/adventure_arena_render.go
+++ b/internal/plugin/adventure_arena_render.go
@@ -134,13 +134,13 @@ type ArenaLeaderboardEntry struct {
 	TotalDeaths     int
 }
 
-func renderArenaLeaderboard(entries []ArenaLeaderboardEntry) string {
+func renderArenaLeaderboard(season string, entries []ArenaLeaderboardEntry) string {
 	if len(entries) == 0 {
-		return "⚔️ **Arena Leaderboard**\n\nNo arena runs recorded yet. Be the first."
+		return fmt.Sprintf("⚔️ **Arena Leaderboard — Season %s**\n\nNobody has entered the arena this season. Be the first.", season)
 	}
 
 	var b strings.Builder
-	b.WriteString("⚔️ **Arena Leaderboard**\n\n")
+	b.WriteString(fmt.Sprintf("⚔️ **Arena Leaderboard — Season %s**\n\n", season))
 
 	medals := []string{"🥇", "🥈", "🥉"}
 	for i, e := range entries {
@@ -157,6 +157,7 @@ func renderArenaLeaderboard(entries []ArenaLeaderboardEntry) string {
 		b.WriteString(fmt.Sprintf("%s **%s** — €%d earned | %s | %d runs | %d deaths\n",
 			prefix, e.DisplayName, e.TotalEarnings, tierLabel, e.TotalRuns, e.TotalDeaths))
 	}
+	b.WriteString("\n_Season standings. `!arena stats` for your lifetime record._")
 
 	return b.String()
 }
diff --git a/internal/plugin/adventure_arena_season.go b/internal/plugin/adventure_arena_season.go
new file mode 100644
index 0000000..339e56d
--- /dev/null
+++ b/internal/plugin/adventure_arena_season.go
@@ -0,0 +1,225 @@
+package plugin
+
+import (
+	"database/sql"
+	"fmt"
+	"log/slog"
+	"strings"
+	"time"
+
+	"gogobee/internal/db"
+
+	"maunium.net/go/mautrix/id"
+)
+
+// ── Arena seasons ───────────────────────────────────────────────────────────
+//
+// Quarterly standings (gogobee_engagement_plan.md C4). The plan called for a
+// quarterly *reset* of arena_stats; this derives season standings from
+// arena_history.created_at instead. Same player-visible effect — the board
+// clears every quarter — but lifetime totals survive for `!arena stats`, and
+// there is no destructive job that can fire twice or half-way.
+//
+// Season titles are archived to their own table rather than player_meta.title:
+// that column already carries the Survivalist milestone, and a season champion
+// overwriting someone's expedition title would silently destroy it.
+
+// arenaSeasonTitleKinds are the two crowns awarded per season.
+const (
+	arenaTitleEarnings = "earnings"
+	arenaTitleStreak   = "streak"
+)
+
+// arenaSeasonKey names the quarter containing t, e.g. "2026-Q3".
+func arenaSeasonKey(t time.Time) string {
+	t = t.UTC()
+	return fmt.Sprintf("%d-Q%d", t.Year(), (int(t.Month())-1)/3+1)
+}
+
+// arenaSeasonStart is the first instant of the quarter containing t.
+func arenaSeasonStart(t time.Time) time.Time {
+	t = t.UTC()
+	firstMonth := time.Month(((int(t.Month())-1)/3)*3 + 1)
+	return time.Date(t.Year(), firstMonth, 1, 0, 0, 0, 0, time.UTC)
+}
+
+// arenaSeasonBounds returns [start, end) for the quarter containing t.
+func arenaSeasonBounds(t time.Time) (time.Time, time.Time) {
+	start := arenaSeasonStart(t)
+	return start, start.AddDate(0, 3, 0)
+}
+
+// previousArenaSeason returns the key and bounds of the quarter before t's.
+func previousArenaSeason(t time.Time) (string, time.Time, time.Time) {
+	prev := arenaSeasonStart(t).AddDate(0, -1, 0) // any instant inside the prior quarter
+	start, end := arenaSeasonBounds(prev)
+	return arenaSeasonKey(prev), start, end
+}
+
+// loadArenaSeasonLeaderboard aggregates arena_history over [start, end) into
+// the same shape the lifetime board renders.
+func loadArenaSeasonLeaderboard(start, end time.Time) ([]ArenaLeaderboardEntry, error) {
+	rows, err := db.Get().Query(`
+		SELECT h.user_id, COALESCE(c.display_name, h.user_id),
+		       SUM(h.earnings),
+		       MAX(h.tier),
+		       SUM(CASE WHEN h.tier = 5 AND h.outcome = 'completed' THEN 1 ELSE 0 END),
+		       COUNT(*),
+		       SUM(CASE WHEN h.outcome = 'dead' THEN 1 ELSE 0 END)
+		FROM arena_history h
+		LEFT JOIN player_meta c ON c.user_id = h.user_id
+		WHERE h.created_at >= ? AND h.created_at < ?
+		GROUP BY h.user_id
+		ORDER BY SUM(h.earnings) DESC
+		LIMIT 10`, start.Unix(), end.Unix())
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+
+	var entries []ArenaLeaderboardEntry
+	for rows.Next() {
+		var e ArenaLeaderboardEntry
+		var uid string
+		if err := rows.Scan(&uid, &e.DisplayName, &e.TotalEarnings, &e.HighestTier,
+			&e.Tier5Completions, &e.TotalRuns, &e.TotalDeaths); err != nil {
+			return nil, err
+		}
+		entries = append(entries, e)
+	}
+	return entries, rows.Err()
+}
+
+// arenaSeasonChampion finds the single top row for a season by the given
+// metric. Returns ok=false when nobody entered the arena that quarter.
+func arenaSeasonChampion(kind string, start, end time.Time) (id.UserID, int64, bool) {
+	var metric string
+	switch kind {
+	case arenaTitleEarnings:
+		metric = "SUM(earnings)"
+	case arenaTitleStreak:
+		metric = "MAX(rounds_survived)"
+	default:
+		return "", 0, false
+	}
+
+	// Only runs that earned or survived something can crown anyone: a season of
+	// nothing but deaths at round zero should award no streak title.
+	q := fmt.Sprintf(`
+		SELECT user_id, %s AS metric
+		FROM arena_history
+		WHERE created_at >= ? AND created_at < ?
+		GROUP BY user_id
+		HAVING metric > 0
+		ORDER BY metric DESC, user_id ASC
+		LIMIT 1`, metric)
+
+	var uid string
+	var value int64
+	err := db.Get().QueryRow(q, start.Unix(), end.Unix()).Scan(&uid, &value)
+	if err == sql.ErrNoRows {
+		return "", 0, false
+	}
+	if err != nil {
+		slog.Error("arena season: champion query", "kind", kind, "err", err)
+		return "", 0, false
+	}
+	return id.UserID(uid), value, true
+}
+
+// recordArenaSeasonTitle archives a crown. Idempotent on (season, kind).
+func recordArenaSeasonTitle(season, kind string, userID id.UserID, value int64, at time.Time) error {
+	_, err := db.Get().Exec(`
+		INSERT INTO arena_season_titles (season, kind, user_id, value, awarded_at)
+		VALUES (?, ?, ?, ?, ?)
+		ON CONFLICT(season, kind) DO NOTHING`,
+		season, kind, string(userID), value, at.Unix())
+	return err
+}
+
+// loadArenaSeasonTitles returns every crown a player has ever taken.
+func loadArenaSeasonTitles(userID id.UserID) ([]string, error) {
+	rows, err := db.Get().Query(`
+		SELECT season, kind FROM arena_season_titles
+		WHERE user_id = ? ORDER BY season DESC`, string(userID))
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+	var out []string
+	for rows.Next() {
+		var season, kind string
+		if err := rows.Scan(&season, &kind); err != nil {
+			return nil, err
+		}
+		out = append(out, fmt.Sprintf("%s %s", season, arenaTitleName(kind)))
+	}
+	return out, rows.Err()
+}
+
+func arenaTitleName(kind string) string {
+	switch kind {
+	case arenaTitleEarnings:
+		return "Coinlord of the Arena"
+	case arenaTitleStreak:
+		return "Longest Walk"
+	}
+	return kind
+}
+
+// ── Rollover ────────────────────────────────────────────────────────────────
+
+// arenaSeasonRollover awards the previous season's crowns exactly once, and
+// announces them. Safe to call every midnight: JobCompleted keyed on the season
+// makes it a no-op for the rest of the quarter, and a bot that was down on the
+// rollover day still catches up the next time it wakes.
+func (p *AdventurePlugin) arenaSeasonRollover(now time.Time) {
+	season, start, end := previousArenaSeason(now)
+	jobName := "arena_season_rollover"
+	if db.JobCompleted(jobName, season) {
+		return
+	}
+	// Guard against awarding a season that hasn't finished yet — only possible
+	// if a caller passes a doctored clock.
+	if !now.UTC().After(end) {
+		return
+	}
+
+	var lines []string
+	for _, kind := range []string{arenaTitleEarnings, arenaTitleStreak} {
+		uid, value, ok := arenaSeasonChampion(kind, start, end)
+		if !ok {
+			continue
+		}
+		if err := recordArenaSeasonTitle(season, kind, uid, value, now); err != nil {
+			slog.Error("arena season: record title failed", "season", season, "kind", kind, "err", err)
+			continue // don't announce a crown we failed to persist
+		}
+		name, _ := loadDisplayName(uid)
+		switch kind {
+		case arenaTitleEarnings:
+			lines = append(lines, fmt.Sprintf("🥇 **%s** — _%s_ (€%d earned)",
+				name, arenaTitleName(kind), value))
+		case arenaTitleStreak:
+			lines = append(lines, fmt.Sprintf("🏃 **%s** — _%s_ (%d rounds in one run)",
+				name, arenaTitleName(kind), value))
+		}
+	}
+
+	db.MarkJobCompleted(jobName, season)
+	if len(lines) == 0 {
+		slog.Info("arena season: closed with no entrants", "season", season)
+		return
+	}
+	slog.Info("arena season: crowned", "season", season, "titles", len(lines))
+
+	gr := gamesRoom()
+	if gr == "" {
+		return
+	}
+	var sb strings.Builder
+	sb.WriteString(fmt.Sprintf("⚔️ **Arena Season %s has ended.**\n\n", season))
+	sb.WriteString(strings.Join(lines, "\n"))
+	sb.WriteString("\n\nThe board is clear. Season " + arenaSeasonKey(now) + " starts now.")
+	p.SendMessage(id.RoomID(gr), sb.String())
+}
diff --git a/internal/plugin/adventure_arena_season_test.go b/internal/plugin/adventure_arena_season_test.go
new file mode 100644
index 0000000..911d833
--- /dev/null
+++ b/internal/plugin/adventure_arena_season_test.go
@@ -0,0 +1,187 @@
+package plugin
+
+import (
+	"testing"
+	"time"
+
+	"gogobee/internal/db"
+
+	"maunium.net/go/mautrix/id"
+)
+
+func TestArenaSeasonKeyAndBounds(t *testing.T) {
+	tests := []struct {
+		when      time.Time
+		key       string
+		wantStart time.Time
+	}{
+		{time.Date(2026, 1, 1, 0, 0, 0, 0, time.UTC), "2026-Q1", time.Date(2026, 1, 1, 0, 0, 0, 0, time.UTC)},
+		{time.Date(2026, 3, 31, 23, 59, 59, 0, time.UTC), "2026-Q1", time.Date(2026, 1, 1, 0, 0, 0, 0, time.UTC)},
+		{time.Date(2026, 4, 1, 0, 0, 0, 0, time.UTC), "2026-Q2", time.Date(2026, 4, 1, 0, 0, 0, 0, time.UTC)},
+		{time.Date(2026, 7, 9, 12, 0, 0, 0, time.UTC), "2026-Q3", time.Date(2026, 7, 1, 0, 0, 0, 0, time.UTC)},
+		{time.Date(2026, 12, 31, 23, 0, 0, 0, time.UTC), "2026-Q4", time.Date(2026, 10, 1, 0, 0, 0, 0, time.UTC)},
+	}
+	for _, tc := range tests {
+		if got := arenaSeasonKey(tc.when); got != tc.key {
+			t.Errorf("arenaSeasonKey(%s) = %s, want %s", tc.when, got, tc.key)
+		}
+		start, end := arenaSeasonBounds(tc.when)
+		if !start.Equal(tc.wantStart) {
+			t.Errorf("season start for %s = %s, want %s", tc.when, start, tc.wantStart)
+		}
+		if !end.Equal(start.AddDate(0, 3, 0)) {
+			t.Errorf("season end for %s is not start+3mo", tc.when)
+		}
+		if !tc.when.Before(end) || tc.when.Before(start) {
+			t.Errorf("%s does not fall inside its own season bounds", tc.when)
+		}
+	}
+}
+
+// TestPreviousArenaSeasonWrapsYear pins the Q1 → prior-year-Q4 edge.
+func TestPreviousArenaSeasonWrapsYear(t *testing.T) {
+	key, start, end := previousArenaSeason(time.Date(2026, 2, 14, 0, 0, 0, 0, time.UTC))
+	if key != "2025-Q4" {
+		t.Errorf("previous season = %s, want 2025-Q4", key)
+	}
+	if !start.Equal(time.Date(2025, 10, 1, 0, 0, 0, 0, time.UTC)) {
+		t.Errorf("start = %s, want 2025-10-01", start)
+	}
+	if !end.Equal(time.Date(2026, 1, 1, 0, 0, 0, 0, time.UTC)) {
+		t.Errorf("end = %s, want 2026-01-01", end)
+	}
+}
+
+func insertArenaRun(t *testing.T, user id.UserID, tier, rounds int, earnings int64, outcome string, at time.Time) {
+	t.Helper()
+	_, err := db.Get().Exec(
+		`INSERT INTO arena_history (user_id, start_tier, tier, rounds_survived, earnings, outcome, monster_name, created_at)
+		 VALUES (?, 1, ?, ?, ?, ?, 'Test Monster', ?)`,
+		string(user), tier, rounds, earnings, outcome, at.Unix())
+	if err != nil {
+		t.Fatal(err)
+	}
+}
+
+// TestArenaSeasonLeaderboardWindowing: only runs inside the season window count.
+func TestArenaSeasonLeaderboardWindowing(t *testing.T) {
+	dir := t.TempDir()
+	db.Close()
+	if err := db.Init(dir); err != nil {
+		t.Fatal(err)
+	}
+	t.Cleanup(db.Close)
+
+	inSeason := time.Date(2026, 8, 1, 0, 0, 0, 0, time.UTC)
+	start, end := arenaSeasonBounds(inSeason)
+
+	alice := id.UserID("@alice:test.invalid")
+	bob := id.UserID("@bob:test.invalid")
+
+	insertArenaRun(t, alice, 3, 4, 5000, "completed", inSeason)
+	insertArenaRun(t, alice, 5, 2, 1000, "dead", inSeason.AddDate(0, 0, 1))
+	insertArenaRun(t, bob, 2, 3, 9000, "cashed_out", inSeason)
+	// Last season — must not appear.
+	insertArenaRun(t, alice, 5, 4, 999999, "completed", start.AddDate(0, 0, -1))
+
+	entries, err := loadArenaSeasonLeaderboard(start, end)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(entries) != 2 {
+		t.Fatalf("got %d entries, want 2", len(entries))
+	}
+	// Bob out-earned Alice this season (9000 vs 6000).
+	if entries[0].DisplayName != string(bob) {
+		t.Errorf("top entry = %s, want bob", entries[0].DisplayName)
+	}
+	if entries[0].TotalEarnings != 9000 {
+		t.Errorf("bob earnings = %d, want 9000", entries[0].TotalEarnings)
+	}
+	if entries[1].TotalEarnings != 6000 {
+		t.Errorf("alice earnings = %d, want 6000 (last season's 999999 must not count)", entries[1].TotalEarnings)
+	}
+	if entries[1].TotalDeaths != 1 {
+		t.Errorf("alice deaths = %d, want 1", entries[1].TotalDeaths)
+	}
+	if entries[1].HighestTier != 5 {
+		t.Errorf("alice highest tier = %d, want 5", entries[1].HighestTier)
+	}
+}
+
+// TestArenaSeasonChampions: earnings crown goes by total, streak crown by the
+// single longest run — they can be different players.
+func TestArenaSeasonChampions(t *testing.T) {
+	dir := t.TempDir()
+	db.Close()
+	if err := db.Init(dir); err != nil {
+		t.Fatal(err)
+	}
+	t.Cleanup(db.Close)
+
+	when := time.Date(2026, 8, 1, 0, 0, 0, 0, time.UTC)
+	start, end := arenaSeasonBounds(when)
+
+	rich := id.UserID("@rich:test.invalid")
+	tough := id.UserID("@tough:test.invalid")
+
+	insertArenaRun(t, rich, 5, 2, 50000, "cashed_out", when)
+	insertArenaRun(t, tough, 1, 12, 500, "completed", when)
+
+	uid, val, ok := arenaSeasonChampion(arenaTitleEarnings, start, end)
+	if !ok || uid != rich || val != 50000 {
+		t.Errorf("earnings champion = (%s, %d, %v), want rich/50000", uid, val, ok)
+	}
+	uid, val, ok = arenaSeasonChampion(arenaTitleStreak, start, end)
+	if !ok || uid != tough || val != 12 {
+		t.Errorf("streak champion = (%s, %d, %v), want tough/12", uid, val, ok)
+	}
+
+	// An empty season crowns nobody.
+	emptyStart, emptyEnd := arenaSeasonBounds(when.AddDate(1, 0, 0))
+	if _, _, ok := arenaSeasonChampion(arenaTitleEarnings, emptyStart, emptyEnd); ok {
+		t.Error("an empty season produced an earnings champion")
+	}
+
+	// A season of nothing but round-zero deaths crowns no streak.
+	deathsOnly := time.Date(2025, 2, 1, 0, 0, 0, 0, time.UTC)
+	dStart, dEnd := arenaSeasonBounds(deathsOnly)
+	insertArenaRun(t, tough, 1, 0, 0, "dead", deathsOnly)
+	if _, _, ok := arenaSeasonChampion(arenaTitleStreak, dStart, dEnd); ok {
+		t.Error("a season of round-zero deaths produced a streak champion")
+	}
+}
+
+// TestRecordArenaSeasonTitleIdempotent: the rollover must be safe to re-run.
+func TestRecordArenaSeasonTitleIdempotent(t *testing.T) {
+	dir := t.TempDir()
+	db.Close()
+	if err := db.Init(dir); err != nil {
+		t.Fatal(err)
+	}
+	t.Cleanup(db.Close)
+
+	now := time.Date(2026, 7, 1, 0, 0, 0, 0, time.UTC)
+	winner := id.UserID("@winner:test.invalid")
+	usurper := id.UserID("@usurper:test.invalid")
+
+	if err := recordArenaSeasonTitle("2026-Q2", arenaTitleEarnings, winner, 100, now); err != nil {
+		t.Fatal(err)
+	}
+	// A second write for the same (season, kind) must not overwrite the crown.
+	if err := recordArenaSeasonTitle("2026-Q2", arenaTitleEarnings, usurper, 999, now); err != nil {
+		t.Fatal(err)
+	}
+
+	titles, err := loadArenaSeasonTitles(winner)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(titles) != 1 {
+		t.Fatalf("winner has %d titles, want 1", len(titles))
+	}
+	stolen, _ := loadArenaSeasonTitles(usurper)
+	if len(stolen) != 0 {
+		t.Errorf("usurper took the crown: %v", stolen)
+	}
+}
diff --git a/internal/plugin/adventure_arena_test.go b/internal/plugin/adventure_arena_test.go
index 8266c6b..874599f 100644
--- a/internal/plugin/adventure_arena_test.go
+++ b/internal/plugin/adventure_arena_test.go
@@ -637,9 +637,9 @@ func TestRenderArenaPersonalStats_WithStats(t *testing.T) {
 }
 
 func TestRenderArenaLeaderboard_Empty(t *testing.T) {
-	text := renderArenaLeaderboard(nil)
-	if !strings.Contains(text, "No arena runs") {
-		t.Error("empty leaderboard should say no runs")
+	text := renderArenaLeaderboard("2026-Q3", nil)
+	if !strings.Contains(text, "Nobody has entered") {
+		t.Error("empty leaderboard should say nobody entered")
 	}
 }
 
@@ -648,7 +648,7 @@ func TestRenderArenaLeaderboard_WithEntries(t *testing.T) {
 		{DisplayName: "Alice", TotalEarnings: 100000, HighestTier: 5, Tier5Completions: 1, TotalRuns: 5, TotalDeaths: 2},
 		{DisplayName: "Bob", TotalEarnings: 50000, HighestTier: 3, TotalRuns: 10, TotalDeaths: 7},
 	}
-	text := renderArenaLeaderboard(entries)
+	text := renderArenaLeaderboard("2026-Q3", entries)
 	if !strings.Contains(text, "Alice") {
 		t.Error("leaderboard should contain Alice")
 	}
diff --git a/internal/plugin/adventure_character.go b/internal/plugin/adventure_character.go
index 3838d67..dbf6a22 100644
--- a/internal/plugin/adventure_character.go
+++ b/internal/plugin/adventure_character.go
@@ -121,6 +121,7 @@ type AdvItem struct {
 	Value       int64
 	Slot        EquipmentSlot // non-empty for MasterworkGear
 	SkillSource string        // non-empty for MasterworkGear
+	Temper      int           // rarity steps above base; magic_item rows only
 }
 
 type AdvBuff struct {
@@ -560,7 +561,7 @@ func saveAdvEquipment(userID id.UserID, eq *AdvEquipment) error {
 func loadAdvInventory(userID id.UserID) ([]AdvItem, error) {
 	d := db.Get()
 	rows, err := d.Query(`
-		SELECT id, name, item_type, tier, value, slot, skill_source
+		SELECT id, name, item_type, tier, value, slot, skill_source, temper
 		FROM adventure_inventory WHERE user_id = ?
 		ORDER BY tier DESC, value DESC`, string(userID))
 	if err != nil {
@@ -572,7 +573,7 @@ func loadAdvInventory(userID id.UserID) ([]AdvItem, error) {
 	for rows.Next() {
 		var it AdvItem
 		var slot string
-		if err := rows.Scan(&it.ID, &it.Name, &it.Type, &it.Tier, &it.Value, &slot, &it.SkillSource); err != nil {
+		if err := rows.Scan(&it.ID, &it.Name, &it.Type, &it.Tier, &it.Value, &slot, &it.SkillSource, &it.Temper); err != nil {
 			return nil, err
 		}
 		it.Slot = EquipmentSlot(slot)
@@ -584,9 +585,19 @@ func loadAdvInventory(userID id.UserID) ([]AdvItem, error) {
 func addAdvInventoryItem(userID id.UserID, item AdvItem) error {
 	d := db.Get()
 	_, err := d.Exec(`
-		INSERT INTO adventure_inventory (user_id, name, item_type, tier, value, slot, skill_source)
-		VALUES (?, ?, ?, ?, ?, ?, ?)`,
-		string(userID), item.Name, item.Type, item.Tier, item.Value, string(item.Slot), item.SkillSource)
+		INSERT INTO adventure_inventory (user_id, name, item_type, tier, value, slot, skill_source, temper)
+		VALUES (?, ?, ?, ?, ?, ?, ?, ?)`,
+		string(userID), item.Name, item.Type, item.Tier, item.Value, string(item.Slot), item.SkillSource, item.Temper)
+	return err
+}
+
+// temperInventoryItem records a tempering step on an un-equipped magic item.
+// Tier and value move with the item's new effective rarity so it keeps sorting
+// and selling correctly.
+func temperInventoryItem(itemID int64, temper, tier int, value int64) error {
+	_, err := db.Get().Exec(
+		`UPDATE adventure_inventory SET temper = ?, tier = ?, value = ? WHERE id = ?`,
+		temper, tier, value, itemID)
 	return err
 }
 
diff --git a/internal/plugin/adventure_flavor_blacksmith.go b/internal/plugin/adventure_flavor_blacksmith.go
index 85685af..911ae82 100644
--- a/internal/plugin/adventure_flavor_blacksmith.go
+++ b/internal/plugin/adventure_flavor_blacksmith.go
@@ -49,6 +49,22 @@ var blacksmithArena = []string{
 	"The Arena gear gets the good tools. I don't use these for everything. Just for things that matter.",
 }
 
+var blacksmithTemperGreetings = []string{
+	"_sets aside the repair work_ You want me to make something _more_ than it is. That's different. That's the good work.",
+	"Tempering. _rolls his shoulders_ I don't repair it. I take it apart and I convince it to come back stronger. It doesn't always want to.",
+	"_wipes the counter clean with one sweep_ Put it down. Right there. Let me see what it could be instead of what it is.",
+	"Anything can be pushed further. Anything. It's just a question of what you're willing to spend and how much heat it can take before it gives in.",
+	"_eyes light up_ Oh, you've come for the real thing. Not a patch. A _change_. Show me. Show me everything you've got.",
+}
+
+var blacksmithTemperCompletion = []string{
+	"_lifts it from the quench, steam everywhere_ Feel the weight of it now. It's not the same thing you handed me. It never will be again.",
+	"_breathing hard_ It fought me. Right to the end it fought me. And now look at it. Look what it became.",
+	"There. _sets it down with enormous care_ I pushed it further than it wanted to go, and it thanked me for it. They always do.",
+	"_holds it up, turning it slowly_ I've been doing this a long time and this one still surprised me. Take it before I change my mind about giving it back.",
+	"It's still hot. It'll be hot for a while. That's what happens when you ask something to become more than it was.",
+}
+
 var blacksmithFullCondition = []string{
 	"_looks it over_ There's nothing to do here. It doesn't need me. _sounds slightly disappointed_ Come back when it does.",
 	"Full condition. You've been taking care of it. Good. I appreciate that in a person.",
diff --git a/internal/plugin/adventure_scheduler.go b/internal/plugin/adventure_scheduler.go
index 06acabb..02bea94 100644
--- a/internal/plugin/adventure_scheduler.go
+++ b/internal/plugin/adventure_scheduler.go
@@ -389,6 +389,9 @@ func (p *AdventurePlugin) midnightTicker() {
 				slog.Error("adventure: midnight reset failed, will retry next tick", "err", err)
 				continue
 			}
+			// Close out the arena season if one just ended. Self-dedups on the
+			// season key, so this is a cheap no-op on every other night.
+			p.arenaSeasonRollover(time.Now().UTC())
 			db.MarkJobCompleted(jobName, dateKey)
 			lastRanDate = dateKey
 		}
diff --git a/internal/plugin/adventure_temper.go b/internal/plugin/adventure_temper.go
new file mode 100644
index 0000000..be6a446
--- /dev/null
+++ b/internal/plugin/adventure_temper.go
@@ -0,0 +1,406 @@
+package plugin
+
+import (
+	"fmt"
+	"log/slog"
+	"strings"
+	"time"
+
+	"maunium.net/go/mautrix/id"
+)
+
+// ── Tempering ───────────────────────────────────────────────────────────────
+//
+// The blacksmith's endgame role: push an owned magic item one rung up the
+// rarity ladder (gogobee_engagement_plan.md B1). Rarity flows through the
+// existing scalar formulas in magic_items_gameplay.go, so tempering adds no
+// new combat math — and because it caps at Legendary it accelerates reaching
+// the existing best-in-slot ceiling rather than raising it. Every duplicate
+// drop becomes a candidate instead of vendor trash.
+//
+// Rarity itself lives on the registry definition, so a tempered instance
+// records its progress as a `temper` step count on its own row; effective
+// rarity is derived on read (see temperedItem).
+
+// temperMaterialNames are the legendary crafting materials the final rung
+// consumes. Both drop as UniqueAlways entries on their T5 zone slate, so one
+// clear of the Underforge or the Abyss Portal yields exactly one.
+var temperMaterialNames = []string{"Thyraks Core", "Portal Fragment"}
+
+// temperStepCost is what one rung costs, keyed by the *target* rarity's tier.
+// The euro costs and foraging gates mirror the crafting recipe tiers in
+// adventure_consumables.go, so the blacksmith reads as an extension of the
+// crafting ladder rather than a parallel economy.
+type temperStepCost struct {
+	Euros         int
+	MinForaging   int
+	NeedsMaterial bool
+}
+
+// Only the final rung demands a T5 material. Gating the lower rungs on one too
+// would make tempering unreachable until a player already clears T5 content —
+// which is exactly when they stop needing it.
+var temperCosts = map[int]temperStepCost{
+	2: {Euros: 10_000, MinForaging: 15},
+	3: {Euros: 25_000, MinForaging: 20},
+	4: {Euros: 60_000, MinForaging: 25},
+	5: {Euros: 150_000, MinForaging: 30, NeedsMaterial: true},
+}
+
+// temperTarget is one temperable item, from either side of the equip line.
+type temperTarget struct {
+	Equipped bool
+	Slot     DnDSlot // set when Equipped
+	InvID    int64   // set when not Equipped
+	Base     MagicItem
+	Temper   int
+}
+
+// Effective is the item as it stands today, before this temper.
+func (t temperTarget) Effective() MagicItem { return temperedItem(t.Base, t.Temper) }
+
+// NextRarity is the rung this temper would buy.
+func (t temperTarget) NextRarity() DnDRarity { return temperedRarity(t.Base.Rarity, t.Temper+1) }
+
+// cost is the price of this target's next rung.
+func (t temperTarget) cost() temperStepCost { return temperCosts[rarityLootTierNum(t.NextRarity())] }
+
+// sameItemAs reports whether other is the same physical instance, used to
+// re-find a target after a fresh reload so a concurrent equip/sell can't let a
+// stale pending confirm temper the wrong thing.
+func (t temperTarget) sameItemAs(other temperTarget) bool {
+	if t.Equipped != other.Equipped {
+		return false
+	}
+	if t.Equipped {
+		return t.Slot == other.Slot && t.Base.ID == other.Base.ID
+	}
+	return t.InvID == other.InvID
+}
+
+type advPendingTemperPick struct {
+	Targets []temperTarget
+}
+
+type advPendingTemperConfirm struct {
+	Target   temperTarget
+	Material *AdvItem // consumed on confirm; nil when the rung needs none
+}
+
+// collectTemperTargets gathers every magic item the player owns that still has
+// a rung ahead of it — worn or stowed. Potions and scrolls are excluded: they
+// carry a zero combat effect, so a rarity bump would buy nothing.
+func collectTemperTargets(userID id.UserID) ([]temperTarget, error) {
+	var out []temperTarget
+
+	equipped, err := loadEquippedMagicItems(userID)
+	if err != nil {
+		return nil, err
+	}
+	for _, ds := range dndSlotOrder {
+		e, ok := equipped[ds]
+		if !ok || e.Item.ID == "" {
+			continue
+		}
+		if temperStepsToLegendary(e.Item.Rarity, e.Temper) == 0 {
+			continue
+		}
+		out = append(out, temperTarget{Equipped: true, Slot: ds, Base: e.Item, Temper: e.Temper})
+	}
+
+	items, err := loadAdvInventory(userID)
+	if err != nil {
+		return nil, err
+	}
+	for _, it := range items {
+		if it.Type != "magic_item" {
+			continue
+		}
+		mi, ok := magicItemFromAdvItem(it)
+		if !ok || mi.Kind == MagicItemPotion || mi.Kind == MagicItemScroll {
+			continue
+		}
+		if temperStepsToLegendary(mi.Rarity, it.Temper) == 0 {
+			continue
+		}
+		out = append(out, temperTarget{InvID: it.ID, Base: mi, Temper: it.Temper})
+	}
+	return out, nil
+}
+
+// findTemperMaterial returns the first legendary material row in inventory.
+func findTemperMaterial(items []AdvItem) (AdvItem, bool) {
+	for _, it := range items {
+		for _, name := range temperMaterialNames {
+			if it.Name == name {
+				return it, true
+			}
+		}
+	}
+	return AdvItem{}, false
+}
+
+// parseTemperIndex reads a leading 1-indexed number and bounds-checks it.
+func parseTemperIndex(reply string, n int) (int, bool) {
+	idx, parsed := 0, false
+	for _, c := range strings.TrimSpace(reply) {
+		if c < '0' || c > '9' {
+			break
+		}
+		idx = idx*10 + int(c-'0')
+		parsed = true
+	}
+	idx--
+	if !parsed || idx < 0 || idx >= n {
+		return 0, false
+	}
+	return idx, true
+}
+
+// ── Command ─────────────────────────────────────────────────────────────────
+
+func (p *AdventurePlugin) handleTemperCmd(ctx MessageContext) error {
+	char, _, err := p.ensureCharacter(ctx.Sender)
+	if err != nil {
+		return p.SendDM(ctx.Sender, "Failed to load your character.")
+	}
+
+	targets, err := collectTemperTargets(ctx.Sender)
+	if err != nil {
+		return p.SendDM(ctx.Sender, "Failed to read your curios.")
+	}
+	if len(targets) == 0 {
+		return p.SendDM(ctx.Sender,
+			"_He looks over your kit and shrugs._ Nothing here I can push any further. "+
+				"Bring me something that isn't already Legendary.")
+	}
+
+	greeting, _ := advPickFlavor(blacksmithTemperGreetings, ctx.Sender, "temper_greet")
+
+	var sb strings.Builder
+	sb.WriteString("🔨 **Tempering**\n\n")
+	sb.WriteString(greeting)
+	sb.WriteString("\n\n")
+	for i, t := range targets {
+		cur := t.Effective()
+		cost := t.cost()
+		where := "stowed"
+		if t.Equipped {
+			where = "worn — " + string(t.Slot)
+		}
+		gate := ""
+		switch {
+		case char.ForagingSkill < cost.MinForaging:
+			gate = fmt.Sprintf(" — 🔒 needs Foraging %d", cost.MinForaging)
+		case cost.NeedsMaterial:
+			gate = " — needs a legendary material"
+		}
+		sb.WriteString(fmt.Sprintf("%d. **%s** _(%s → %s)_ — €%d _(%s)_%s\n",
+			i+1, cur.Name, cur.Rarity, t.NextRarity(), cost.Euros, where, gate))
+	}
+	sb.WriteString("\nReply with a number to temper it, or \"cancel\".")
+
+	p.pending.Store(string(ctx.Sender), &advPendingInteraction{
+		Type:      "temper_pick",
+		Data:      &advPendingTemperPick{Targets: targets},
+		ExpiresAt: time.Now().Add(advDMResponseWindow),
+	})
+	return p.SendDM(ctx.Sender, sb.String())
+}
+
+func (p *AdventurePlugin) resolveTemperPick(ctx MessageContext, interaction *advPendingInteraction) error {
+	data := interaction.Data.(*advPendingTemperPick)
+	reply := strings.TrimSpace(ctx.Body)
+	if strings.EqualFold(reply, "cancel") {
+		return p.SendDM(ctx.Sender, "_The forge keeps burning._ Come back when you've decided.")
+	}
+	idx, ok := parseTemperIndex(reply, len(data.Targets))
+	if !ok {
+		p.pending.Store(string(ctx.Sender), interaction)
+		return p.SendDM(ctx.Sender, "Reply with a number from the list, or \"cancel\".")
+	}
+	return p.buildTemperConfirm(ctx.Sender, data.Targets[idx])
+}
+
+// buildTemperConfirm re-checks every gate against fresh state before quoting a
+// price, then parks a confirm. executeTemper re-checks them all again — this
+// pass exists to give the player a real error message, not to be trusted.
+func (p *AdventurePlugin) buildTemperConfirm(userID id.UserID, t temperTarget) error {
+	char, _, err := p.ensureCharacter(userID)
+	if err != nil {
+		return p.SendDM(userID, "Failed to load your character.")
+	}
+	cost := t.cost()
+	if char.ForagingSkill < cost.MinForaging {
+		return p.SendDM(userID, fmt.Sprintf(
+			"_He turns the piece over, then sets it down._ I could ruin this. Come back when you know your "+
+				"materials better — **Foraging %d**. You're at %d.", cost.MinForaging, char.ForagingSkill))
+	}
+
+	items, err := loadAdvInventory(userID)
+	if err != nil {
+		return p.SendDM(userID, "Failed to read your inventory.")
+	}
+	var material *AdvItem
+	if cost.NeedsMaterial {
+		mat, ok := findTemperMaterial(items)
+		if !ok {
+			return p.SendDM(userID, fmt.Sprintf(
+				"_He exhales through his teeth._ Legendary is a different conversation. I need a **%s** on this "+
+					"table before I touch it. They come out of the deepest places — the Underforge, the Portal.",
+				strings.Join(temperMaterialNames, "** or a **")))
+		}
+		material = &mat
+	}
+
+	if bal := p.euro.GetBalance(userID); bal < float64(cost.Euros) {
+		return p.SendDM(userID, fmt.Sprintf(
+			"_He names the price without apology._ €%d. You have €%.0f. The forge doesn't run on good intentions.",
+			cost.Euros, bal))
+	}
+
+	cur := t.Effective()
+	next := temperedItem(t.Base, t.Temper+1)
+
+	var sb strings.Builder
+	sb.WriteString(fmt.Sprintf("🔨 **Temper %s?**\n\n", cur.Name))
+	sb.WriteString(fmt.Sprintf("  %s _(%s)_ → %s _(%s)_\n", cur.Name, cur.Rarity, next.Name, next.Rarity))
+	sb.WriteString(fmt.Sprintf("  %s\n  ↳ %s\n\n", magicItemEffectSummary(cur), magicItemEffectSummary(next)))
+	sb.WriteString(fmt.Sprintf("  Cost: **€%d**", cost.Euros))
+	if material != nil {
+		sb.WriteString(fmt.Sprintf(" + one **%s**", material.Name))
+	}
+	sb.WriteString("\n\nReply \"yes\" to hand it over, or anything else to keep it as it is.")
+
+	p.pending.Store(string(userID), &advPendingInteraction{
+		Type:      "temper_confirm",
+		Data:      &advPendingTemperConfirm{Target: t, Material: material},
+		ExpiresAt: time.Now().Add(advDMResponseWindow),
+	})
+	return p.SendDM(userID, sb.String())
+}
+
+func (p *AdventurePlugin) resolveTemperConfirm(ctx MessageContext, interaction *advPendingInteraction) error {
+	userMu := p.advUserLock(ctx.Sender)
+	userMu.Lock()
+	defer userMu.Unlock()
+
+	data := interaction.Data.(*advPendingTemperConfirm)
+	reply := strings.ToLower(strings.TrimSpace(ctx.Body))
+	if reply != "yes" && reply != "y" && reply != "confirm" {
+		return p.SendDM(ctx.Sender, "_He nods once and turns back to the fire._ It's a good piece as it is.")
+	}
+	return p.executeTemper(ctx.Sender, data)
+}
+
+// executeTemper re-validates against fresh state, then charges and applies.
+// Order matters: the euro debit is the only atomic guard we have, so it goes
+// first; the material and the temper write both roll back onto it.
+func (p *AdventurePlugin) executeTemper(userID id.UserID, data *advPendingTemperConfirm) error {
+	char, _, err := p.ensureCharacter(userID)
+	if err != nil {
+		return p.SendDM(userID, "Failed to load your character.")
+	}
+
+	// Re-find the target. Between the confirm prompt and this reply the
+	// player may have equipped, sold, or already tempered it.
+	fresh, err := collectTemperTargets(userID)
+	if err != nil {
+		return p.SendDM(userID, "Failed to read your curios.")
+	}
+	var target temperTarget
+	found := false
+	for _, t := range fresh {
+		if t.sameItemAs(data.Target) {
+			target, found = t, true
+			break
+		}
+	}
+	if !found {
+		return p.SendDM(userID, "_He looks at the empty table._ That piece isn't here any more.")
+	}
+	if target.Temper != data.Target.Temper {
+		return p.SendDM(userID, "_He raises an eyebrow._ Someone's already been at this one. Ask me again.")
+	}
+
+	cost := target.cost()
+	if char.ForagingSkill < cost.MinForaging {
+		return p.SendDM(userID, fmt.Sprintf("You need **Foraging %d** for that.", cost.MinForaging))
+	}
+
+	// Re-locate the material by row id — a concurrent craft may have eaten it.
+	var material *AdvItem
+	if cost.NeedsMaterial {
+		items, err := loadAdvInventory(userID)
+		if err != nil {
+			return p.SendDM(userID, "Failed to read your inventory.")
+		}
+		mat, ok := findTemperMaterial(items)
+		if !ok {
+			return p.SendDM(userID, "_He taps the empty spot on the table._ The material's gone. Find another.")
+		}
+		material = &mat
+	}
+
+	if !p.euro.Debit(userID, float64(cost.Euros), "temper") {
+		return p.SendDM(userID, fmt.Sprintf("Payment failed — tempering costs €%d.", cost.Euros))
+	}
+
+	refund := func(reason string) {
+		p.euro.Credit(userID, float64(cost.Euros), "temper_refund")
+		slog.Error("temper: rolled back", "user", userID, "item", target.Base.ID, "reason", reason)
+	}
+
+	if material != nil {
+		if err := removeAdvInventoryItem(material.ID); err != nil {
+			refund("material consume failed")
+			return p.SendDM(userID, "Something went wrong at the forge. Your money is back.")
+		}
+	}
+
+	newTemper := target.Temper + 1
+	if target.Equipped {
+		err = temperEquippedItem(userID, target.Slot, newTemper)
+	} else {
+		bumped := temperedItem(target.Base, newTemper)
+		err = temperInventoryItem(target.InvID, newTemper, rarityLootTierNum(bumped.Rarity), int64(bumped.Value))
+	}
+	if err != nil {
+		refund("temper write failed")
+		if material != nil {
+			if rbErr := addAdvInventoryItem(userID, *material); rbErr != nil {
+				slog.Error("temper: material rollback failed",
+					"user", userID, "material", material.Name, "err", rbErr)
+			}
+		}
+		return p.SendDM(userID, "Something went wrong at the forge. Your money is back.")
+	}
+
+	result := temperedItem(target.Base, newTemper)
+	line, _ := advPickFlavor(blacksmithTemperCompletion, userID, "temper_done")
+
+	var sb strings.Builder
+	sb.WriteString(line)
+	sb.WriteString(fmt.Sprintf("\n\n🔨 **%s** is now **%s**.\n%s\n",
+		result.Name, result.Rarity, magicItemEffectSummary(result)))
+	if remaining := temperStepsToLegendary(target.Base.Rarity, newTemper); remaining > 0 {
+		sb.WriteString(fmt.Sprintf("\n_%d more temper%s would make it Legendary._",
+			remaining, pluralS(remaining)))
+	}
+	if err := p.SendDM(userID, sb.String()); err != nil {
+		return err
+	}
+
+	if result.Rarity == RarityLegendary {
+		if p.achievements != nil {
+			p.achievements.GrantAchievement(userID, "temper_legendary")
+		}
+		if gr := gamesRoom(); gr != "" {
+			displayName, _ := loadDisplayName(userID)
+			p.SendMessage(id.RoomID(gr), fmt.Sprintf(
+				"🔨 The forge in town ran hot all night. **%s** walked out with a **Legendary %s**.",
+				displayName, result.Name))
+		}
+	}
+	return nil
+}
diff --git a/internal/plugin/adventure_temper_test.go b/internal/plugin/adventure_temper_test.go
new file mode 100644
index 0000000..2c5862d
--- /dev/null
+++ b/internal/plugin/adventure_temper_test.go
@@ -0,0 +1,355 @@
+package plugin
+
+import (
+	"testing"
+
+	"gogobee/internal/db"
+
+	"maunium.net/go/mautrix/id"
+)
+
+// TestTemperLadderWalk pins the rung order and the Legendary clamp. VeryRare
+// must fold onto Epic — it shares Epic's tier and power scalar, so treating it
+// as its own rung would sell a step that changes no number.
+func TestTemperLadderWalk(t *testing.T) {
+	tests := []struct {
+		base  DnDRarity
+		steps int
+		want  DnDRarity
+	}{
+		{RarityCommon, 0, RarityCommon},
+		{RarityCommon, 1, RarityUncommon},
+		{RarityCommon, 4, RarityLegendary},
+		{RarityCommon, 99, RarityLegendary}, // clamp, never past the ceiling
+		{RarityRare, 1, RarityEpic},
+		{RarityEpic, 1, RarityLegendary},
+		{RarityLegendary, 1, RarityLegendary},
+		{RarityVeryRare, 0, RarityVeryRare}, // untempered items keep their label
+		{RarityVeryRare, 1, RarityLegendary},
+		{RarityUncommon, -1, RarityUncommon}, // negative steps are inert
+	}
+	for _, tc := range tests {
+		if got := temperedRarity(tc.base, tc.steps); got != tc.want {
+			t.Errorf("temperedRarity(%s, %d) = %s, want %s", tc.base, tc.steps, got, tc.want)
+		}
+	}
+}
+
+func TestTemperStepsToLegendary(t *testing.T) {
+	tests := []struct {
+		base  DnDRarity
+		steps int
+		want  int
+	}{
+		{RarityCommon, 0, 4},
+		{RarityCommon, 2, 2},
+		{RarityCommon, 4, 0},
+		{RarityCommon, 10, 0},
+		{RarityVeryRare, 0, 1}, // folds onto Epic, one rung short
+		{RarityLegendary, 0, 0},
+	}
+	for _, tc := range tests {
+		if got := temperStepsToLegendary(tc.base, tc.steps); got != tc.want {
+			t.Errorf("temperStepsToLegendary(%s, %d) = %d, want %d", tc.base, tc.steps, got, tc.want)
+		}
+	}
+}
+
+// TestTemperCostsCoverEveryRung guards against a ladder edit that leaves a rung
+// priced at the zero value — a free temper.
+func TestTemperCostsCoverEveryRung(t *testing.T) {
+	for rung := 1; rung < len(temperLadder); rung++ {
+		target := temperLadder[rung]
+		cost, ok := temperCosts[rarityLootTierNum(target)]
+		if !ok {
+			t.Fatalf("no temper cost for target rarity %s", target)
+		}
+		if cost.Euros <= 0 || cost.MinForaging <= 0 {
+			t.Errorf("temper to %s is free: %+v", target, cost)
+		}
+	}
+	// Only the Legendary rung consumes a material.
+	for tier, cost := range temperCosts {
+		if want := tier == 5; cost.NeedsMaterial != want {
+			t.Errorf("tier %d NeedsMaterial = %v, want %v", tier, cost.NeedsMaterial, want)
+		}
+	}
+}
+
+// TestTemperedItemScalesPowerAndValue asserts a tempered item is exactly an
+// item of its effective rarity — the whole point of B1 is that rarity flows
+// through the existing scalar formulas with no new combat math.
+func TestTemperedItemScalesPowerAndValue(t *testing.T) {
+	base := MagicItem{ID: "x", Name: "Thing", Kind: MagicItemWeapon, Rarity: RarityRare, Value: 300}
+
+	if got := temperedItem(base, 0); got != base {
+		t.Errorf("temper 0 mutated the item: %+v", got)
+	}
+
+	up := temperedItem(base, 1)
+	if up.Rarity != RarityEpic {
+		t.Fatalf("rarity = %s, want Epic", up.Rarity)
+	}
+	// Value tracks the power axis: Rare=3 → Epic=4.
+	if wantVal := int(300 * (rarityPowerScalar(RarityEpic) / rarityPowerScalar(RarityRare))); up.Value != wantVal {
+		t.Errorf("value = %d, want %d", up.Value, wantVal)
+	}
+	// A tempered Epic must fight exactly like a native Epic. (Its Value is
+	// deliberately higher than a native Epic definition's — value tracks the
+	// power axis, and the player paid to move it there.)
+	native := base
+	native.Rarity = RarityEpic
+	if magicItemEffectFor(up) != magicItemEffectFor(native) {
+		t.Errorf("tempered effect diverges from native Epic effect")
+	}
+	// Base must be untouched — temperedItem takes a copy.
+	if base.Rarity != RarityRare || base.Value != 300 {
+		t.Errorf("temperedItem mutated its argument: %+v", base)
+	}
+}
+
+// TestTemperNeverDoubleBumps is the invariant the whole design hangs on: the
+// stored row keeps BASE rarity plus a step count, so loading and re-saving an
+// item any number of times must not compound the upgrade.
+func TestTemperNeverDoubleBumps(t *testing.T) {
+	base := MagicItem{ID: "x", Name: "Thing", Kind: MagicItemWeapon, Rarity: RarityCommon, Value: 100}
+	e := EquippedMagicItem{Item: base, Temper: 2}
+
+	first := e.Effective()
+	// Simulate a load→save→load cycle: Item stays base, Temper stays put.
+	again := EquippedMagicItem{Item: e.Item, Temper: e.Temper}.Effective()
+	if first != again {
+		t.Errorf("round-trip changed the item: %+v vs %+v", first, again)
+	}
+	if e.Item.Rarity != RarityCommon {
+		t.Errorf("Effective() mutated the stored base rarity to %s", e.Item.Rarity)
+	}
+	if first.Rarity != RarityRare {
+		t.Errorf("Common + 2 tempers = %s, want Rare", first.Rarity)
+	}
+}
+
+// TestTemperSurvivesEquipRoundTrip: a tempered item that gets swapped back to
+// inventory must carry its temper with it, priced at its effective rarity.
+// This is the path resolveMagicEquipReply takes on a slot swap.
+func TestTemperSurvivesEquipRoundTrip(t *testing.T) {
+	base := MagicItem{ID: "x", Name: "Thing", Kind: MagicItemWeapon, Rarity: RarityCommon, Value: 100}
+
+	back := magicItemSellAt(base, 3)
+	if back.Temper != 3 {
+		t.Errorf("swap-back lost temper: %d", back.Temper)
+	}
+	if back.Tier != rarityLootTierNum(RarityEpic) {
+		t.Errorf("swap-back tier = %d, want Epic tier", back.Tier)
+	}
+	if back.Value <= int64(base.Value) {
+		t.Errorf("swap-back value %d not scaled up from %d", back.Value, base.Value)
+	}
+	// An untempered sell must be byte-identical to the old behaviour.
+	if magicItemSellAt(base, 0) != magicItemSell(base) {
+		t.Errorf("magicItemSellAt(_, 0) diverges from magicItemSell")
+	}
+}
+
+// TestTemperPersistence exercises the two DB writes: an equipped item's temper
+// and a stowed item's temper both survive a reload, and loadEquippedMagicItems
+// hands back a base-rarity Item with the step count beside it.
+func TestTemperPersistence(t *testing.T) {
+	dir := t.TempDir()
+	db.Close()
+	if err := db.Init(dir); err != nil {
+		t.Fatal(err)
+	}
+	t.Cleanup(db.Close)
+
+	user := id.UserID("@temper:test.invalid")
+
+	var item MagicItem
+	for _, mi := range magicItemRegistry {
+		if mi.Slot != "" && mi.Rarity == RarityCommon {
+			item = mi
+			break
+		}
+	}
+	if item.ID == "" {
+		for _, mi := range magicItemRegistry {
+			if mi.Slot != "" && temperStepsToLegendary(mi.Rarity, 0) > 0 {
+				item = mi
+				break
+			}
+		}
+	}
+	if item.ID == "" {
+		t.Skip("no slotted sub-Legendary item in registry")
+	}
+
+	if err := equipMagicItem(user, item.Slot, item.ID, false, 0); err != nil {
+		t.Fatal(err)
+	}
+	if err := temperEquippedItem(user, item.Slot, 1); err != nil {
+		t.Fatal(err)
+	}
+	equipped, err := loadEquippedMagicItems(user)
+	if err != nil {
+		t.Fatal(err)
+	}
+	e := equipped[item.Slot]
+	if e.Temper != 1 {
+		t.Fatalf("equipped temper = %d, want 1", e.Temper)
+	}
+	if e.Item.Rarity != item.Rarity {
+		t.Errorf("stored Item.Rarity = %s, want the untouched base %s", e.Item.Rarity, item.Rarity)
+	}
+	if want := temperedRarity(item.Rarity, 1); e.Effective().Rarity != want {
+		t.Errorf("Effective().Rarity = %s, want %s", e.Effective().Rarity, want)
+	}
+
+	// Stowed side: a fresh inventory row defaults to temper 0, then bumps.
+	inv := AdvItem{Name: item.Name, Type: "magic_item", Tier: 1, Value: 100,
+		SkillSource: "magic_item:" + item.ID}
+	if err := addAdvInventoryItem(user, inv); err != nil {
+		t.Fatal(err)
+	}
+	items, err := loadAdvInventory(user)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(items) != 1 || items[0].Temper != 0 {
+		t.Fatalf("fresh inventory row should default to temper 0, got %+v", items)
+	}
+	bumped := temperedItem(item, 2)
+	if err := temperInventoryItem(items[0].ID, 2, rarityLootTierNum(bumped.Rarity), int64(bumped.Value)); err != nil {
+		t.Fatal(err)
+	}
+	items, _ = loadAdvInventory(user)
+	if items[0].Temper != 2 {
+		t.Errorf("inventory temper = %d, want 2", items[0].Temper)
+	}
+	if items[0].Tier != rarityLootTierNum(bumped.Rarity) {
+		t.Errorf("inventory tier = %d, want %d", items[0].Tier, rarityLootTierNum(bumped.Rarity))
+	}
+}
+
+// TestCollectTemperTargetsFiltering: Legendary items and consumable-kind magic
+// items (potions/scrolls, whose combat effect is zero) are not offerable.
+func TestCollectTemperTargetsFiltering(t *testing.T) {
+	dir := t.TempDir()
+	db.Close()
+	if err := db.Init(dir); err != nil {
+		t.Fatal(err)
+	}
+	t.Cleanup(db.Close)
+
+	user := id.UserID("@filter:test.invalid")
+
+	var legendary, potion, upgradable MagicItem
+	for _, mi := range magicItemRegistry {
+		if legendary.ID == "" && mi.Rarity == RarityLegendary && mi.Slot != "" {
+			legendary = mi
+		}
+		if potion.ID == "" && (mi.Kind == MagicItemPotion || mi.Kind == MagicItemScroll) {
+			potion = mi
+		}
+		if upgradable.ID == "" && mi.Slot != "" && mi.Kind == MagicItemWeapon &&
+			temperStepsToLegendary(mi.Rarity, 0) > 0 {
+			upgradable = mi
+		}
+	}
+
+	add := func(mi MagicItem) {
+		if mi.ID == "" {
+			return
+		}
+		if err := addAdvInventoryItem(user, AdvItem{
+			Name: mi.Name, Type: "magic_item", Tier: rarityLootTierNum(mi.Rarity),
+			Value: int64(mi.Value), SkillSource: "magic_item:" + mi.ID,
+		}); err != nil {
+			t.Fatal(err)
+		}
+	}
+	add(legendary)
+	add(potion)
+	add(upgradable)
+
+	targets, err := collectTemperTargets(user)
+	if err != nil {
+		t.Fatal(err)
+	}
+	for _, tg := range targets {
+		if legendary.ID != "" && tg.Base.ID == legendary.ID {
+			t.Errorf("Legendary %s offered for tempering", legendary.Name)
+		}
+		if potion.ID != "" && tg.Base.ID == potion.ID {
+			t.Errorf("consumable %s offered for tempering", potion.Name)
+		}
+	}
+	if upgradable.ID != "" {
+		found := false
+		for _, tg := range targets {
+			if tg.Base.ID == upgradable.ID {
+				found = true
+			}
+		}
+		if !found {
+			t.Errorf("upgradable %s (%s) was not offered", upgradable.Name, upgradable.Rarity)
+		}
+	}
+}
+
+// TestTemperMaterialsAreObtainable guards the economy: every material name the
+// final rung demands must actually drop from some zone's loot slate. If a slate
+// is renamed, tempering to Legendary silently becomes impossible.
+func TestTemperMaterialsAreObtainable(t *testing.T) {
+	live := map[string]bool{}
+	for _, zone := range allZones() {
+		for _, entry := range zone.Loot {
+			live[titleCaseUnderscored(entry.ItemID)] = true
+		}
+	}
+	for _, name := range temperMaterialNames {
+		if !live[name] {
+			t.Errorf("temper material %q drops from no zone loot slate", name)
+		}
+	}
+}
+
+// TestFindTemperMaterial picks the first material regardless of which one.
+func TestFindTemperMaterial(t *testing.T) {
+	if _, ok := findTemperMaterial(nil); ok {
+		t.Error("found a material in an empty inventory")
+	}
+	if _, ok := findTemperMaterial([]AdvItem{{Name: "Iron Ore"}}); ok {
+		t.Error("Iron Ore accepted as a legendary material")
+	}
+	for _, name := range temperMaterialNames {
+		got, ok := findTemperMaterial([]AdvItem{{Name: "Iron Ore"}, {ID: 7, Name: name}})
+		if !ok || got.ID != 7 {
+			t.Errorf("did not find material %q", name)
+		}
+	}
+}
+
+func TestParseTemperIndex(t *testing.T) {
+	tests := []struct {
+		in     string
+		n      int
+		want   int
+		wantOK bool
+	}{
+		{"1", 3, 0, true},
+		{"3", 3, 2, true},
+		{" 2 ", 3, 1, true},
+		{"2. Thing", 3, 1, true},
+		{"0", 3, 0, false},
+		{"4", 3, 0, false},
+		{"", 3, 0, false},
+		{"cancel", 3, 0, false},
+	}
+	for _, tc := range tests {
+		got, ok := parseTemperIndex(tc.in, tc.n)
+		if ok != tc.wantOK || (ok && got != tc.want) {
+			t.Errorf("parseTemperIndex(%q, %d) = (%d, %v), want (%d, %v)",
+				tc.in, tc.n, got, ok, tc.want, tc.wantOK)
+		}
+	}
+}
diff --git a/internal/plugin/dnd_sheet.go b/internal/plugin/dnd_sheet.go
index cc5eea0..032e28c 100644
--- a/internal/plugin/dnd_sheet.go
+++ b/internal/plugin/dnd_sheet.go
@@ -161,9 +161,14 @@ func renderDnDSheet(c *DnDCharacter, adv *AdventureCharacter, meta *PlayerMeta,
 					status = " — **(inactive)** _unbonded_"
 				}
 			}
-			b.WriteString(fmt.Sprintf("  %s %-9s %s _(%s)_%s\n    %s\n",
-				rarityIcon(e.Item.Rarity), string(ds), e.Item.Name, e.Item.Rarity,
-				status, magicItemEffectSummary(e.Item)))
+			mi := e.Effective()
+			temperMark := ""
+			if e.Temper > 0 {
+				temperMark = " 🔨"
+			}
+			b.WriteString(fmt.Sprintf("  %s %-9s %s%s _(%s)_%s\n    %s\n",
+				rarityIcon(mi.Rarity), string(ds), mi.Name, temperMark, mi.Rarity,
+				status, magicItemEffectSummary(mi)))
 		}
 	}
 
diff --git a/internal/plugin/magic_items_gameplay.go b/internal/plugin/magic_items_gameplay.go
index f1989ed..21db843 100644
--- a/internal/plugin/magic_items_gameplay.go
+++ b/internal/plugin/magic_items_gameplay.go
@@ -72,16 +72,23 @@ func pickMagicItemForRarity(r DnDRarity, rng *rand.Rand) (MagicItem, bool) {
 // magicItemSell builds the AdvItem an inventory deposit uses for a magic item.
 // Potions and scrolls land as "consumable" so the combat pipeline picks them
 // up (see magicItemConsumableDefByName); everything else is a "magic_item".
-func magicItemSell(mi MagicItem) AdvItem {
+func magicItemSell(mi MagicItem) AdvItem { return magicItemSellAt(mi, 0) }
+
+// magicItemSellAt is magicItemSell for an instance carrying temper steps: the
+// row it produces is priced and tiered at the item's effective rarity, and
+// remembers the temper so equipping it again restores the upgrade.
+func magicItemSellAt(mi MagicItem, temper int) AdvItem {
 	typ := "magic_item"
 	if mi.Kind == MagicItemPotion || mi.Kind == MagicItemScroll {
 		typ = "consumable"
 	}
+	eff := temperedItem(mi, temper)
 	return AdvItem{
-		Name:  mi.Name,
-		Type:  typ,
-		Tier:  rarityLootTierNum(mi.Rarity),
-		Value: int64(mi.Value),
+		Name:   eff.Name,
+		Type:   typ,
+		Tier:   rarityLootTierNum(eff.Rarity),
+		Value:  int64(eff.Value),
+		Temper: temper,
 	}
 }
 
@@ -103,6 +110,66 @@ func rarityLootTierNum(r DnDRarity) int {
 	return 1
 }
 
+// ── Tempering: per-instance rarity above the definition's base ──────────────
+
+// temperLadder is the rarity ladder tempering walks. VeryRare is absent by
+// design: it collapses onto Epic in both rarityLootTierNum and
+// rarityPowerScalar, so treating it as a distinct rung would sell the player
+// a step that changes no number.
+var temperLadder = []DnDRarity{RarityCommon, RarityUncommon, RarityRare, RarityEpic, RarityLegendary}
+
+// temperRung locates a rarity on temperLadder, folding VeryRare onto Epic.
+func temperRung(r DnDRarity) int {
+	if r == RarityVeryRare {
+		r = RarityEpic
+	}
+	for i, lr := range temperLadder {
+		if lr == r {
+			return i
+		}
+	}
+	return 0
+}
+
+// temperedRarity applies steps rungs of tempering to a base rarity, clamped at
+// Legendary. Callers derive this on read — the base rarity on the registry
+// definition stays authoritative, so an item can never double-bump across a
+// load/save round-trip.
+func temperedRarity(base DnDRarity, steps int) DnDRarity {
+	if steps <= 0 {
+		return base
+	}
+	rung := temperRung(base) + steps
+	if rung >= len(temperLadder) {
+		rung = len(temperLadder) - 1
+	}
+	return temperLadder[rung]
+}
+
+// temperStepsToLegendary reports how many tempers an item at this base rarity
+// and temper count still has ahead of it.
+func temperStepsToLegendary(base DnDRarity, steps int) int {
+	return (len(temperLadder) - 1) - temperRung(temperedRarity(base, steps))
+}
+
+// temperedItem returns a copy of mi at its effective rarity. Everything that
+// reads rarity for gameplay — effects, sell value, display — goes through here.
+func temperedItem(mi MagicItem, steps int) MagicItem {
+	if steps <= 0 {
+		return mi
+	}
+	eff := temperedRarity(mi.Rarity, steps)
+	if eff == mi.Rarity {
+		return mi
+	}
+	// Value tracks the power axis, so a tempered item is worth what an item
+	// of its effective rarity is worth.
+	scaled := float64(mi.Value) * (rarityPowerScalar(eff) / rarityPowerScalar(mi.Rarity))
+	mi.Value = int(scaled)
+	mi.Rarity = eff
+	return mi
+}
+
 // ── Codified combat-effect formula ──────────────────────────────────────────
 
 // magicItemEffect is the combat delta a single equipped magic item grants.
@@ -172,10 +239,16 @@ func magicItemEffectFor(mi MagicItem) magicItemEffect {
 // registry. Item is the registry entry; Attuned mirrors the DB column.
 type EquippedMagicItem struct {
 	Slot    DnDSlot
-	Item    MagicItem
+	Item    MagicItem // registry definition, at its BASE rarity
 	Attuned bool
+	Temper  int
 }
 
+// Effective is the item as the game should see it: base definition plus any
+// tempering the player has paid for. Item stays at base rarity so re-saving an
+// equipped row can't compound the bump.
+func (e EquippedMagicItem) Effective() MagicItem { return temperedItem(e.Item, e.Temper) }
+
 // dndMagicItemAttuneLimit — 5e's three-attunement cap. Items that require
 // attunement only grant their effect while attuned, and a player may hold at
 // most this many attunements at once.
@@ -183,7 +256,7 @@ const dndMagicItemAttuneLimit = 3
 
 func loadEquippedMagicItems(userID id.UserID) (map[DnDSlot]EquippedMagicItem, error) {
 	d := db.Get()
-	rows, err := d.Query(`SELECT slot, item_id, attuned FROM magic_item_equipped WHERE user_id = ?`,
+	rows, err := d.Query(`SELECT slot, item_id, attuned, temper FROM magic_item_equipped WHERE user_id = ?`,
 		string(userID))
 	if err != nil {
 		return nil, err
@@ -193,8 +266,8 @@ func loadEquippedMagicItems(userID id.UserID) (map[DnDSlot]EquippedMagicItem, er
 	out := make(map[DnDSlot]EquippedMagicItem)
 	for rows.Next() {
 		var slot, itemID string
-		var attuned int
-		if err := rows.Scan(&slot, &itemID, &attuned); err != nil {
+		var attuned, temper int
+		if err := rows.Scan(&slot, &itemID, &attuned, &temper); err != nil {
 			return nil, err
 		}
 		mi, ok := magicItemRegistry[itemID]
@@ -205,24 +278,34 @@ func loadEquippedMagicItems(userID id.UserID) (map[DnDSlot]EquippedMagicItem, er
 			Slot:    DnDSlot(slot),
 			Item:    mi,
 			Attuned: attuned == 1,
+			Temper:  temper,
 		}
 	}
 	return out, rows.Err()
 }
 
 // equipMagicItem writes (or replaces) the item in its slot. attuned is only
-// honoured when the item requires attunement.
-func equipMagicItem(userID id.UserID, slot DnDSlot, itemID string, attuned bool) error {
+// honoured when the item requires attunement. temper rides along from the
+// inventory row so tempering survives being worn.
+func equipMagicItem(userID id.UserID, slot DnDSlot, itemID string, attuned bool, temper int) error {
 	d := db.Get()
 	a := 0
 	if attuned {
 		a = 1
 	}
 	_, err := d.Exec(`
-		INSERT INTO magic_item_equipped (user_id, slot, item_id, attuned)
-		VALUES (?, ?, ?, ?)
-		ON CONFLICT(user_id, slot) DO UPDATE SET item_id = excluded.item_id, attuned = excluded.attuned`,
-		string(userID), string(slot), itemID, a)
+		INSERT INTO magic_item_equipped (user_id, slot, item_id, attuned, temper)
+		VALUES (?, ?, ?, ?, ?)
+		ON CONFLICT(user_id, slot) DO UPDATE SET
+			item_id = excluded.item_id, attuned = excluded.attuned, temper = excluded.temper`,
+		string(userID), string(slot), itemID, a, temper)
+	return err
+}
+
+// temperEquippedItem bumps the temper on a worn item in place.
+func temperEquippedItem(userID id.UserID, slot DnDSlot, temper int) error {
+	_, err := db.Get().Exec(`UPDATE magic_item_equipped SET temper = ? WHERE user_id = ? AND slot = ?`,
+		temper, string(userID), string(slot))
 	return err
 }
 
@@ -262,7 +345,7 @@ func applyMagicItemEffects(stats *CombatStats, mods *CombatModifiers, userID id.
 		if e.Item.Attunement && !e.Attuned {
 			continue // unattuned attunement item is inert
 		}
-		eff := magicItemEffectFor(e.Item)
+		eff := magicItemEffectFor(e.Effective())
 		mods.DamageBonus += eff.DamageBonus
 		if eff.DamageReductMult != 0 && eff.DamageReductMult != 1.0 {
 			mods.DamageReduct *= eff.DamageReductMult
@@ -464,7 +547,8 @@ func (p *AdventurePlugin) handleEquipMagicCmd(ctx MessageContext) error {
 	var sb strings.Builder
 	sb.WriteString("🔮 **Equippable magic items:**\n\n")
 	for i, it := range magic {
-		mi, _ := magicItemFromAdvItem(it)
+		base, _ := magicItemFromAdvItem(it)
+		mi := temperedItem(base, it.Temper)
 		curDesc := "empty"
 		if cur, ok := equipped[mi.Slot]; ok && cur.Item.ID != "" {
 			curDesc = cur.Item.Name
@@ -528,7 +612,7 @@ func (p *AdventurePlugin) resolveMagicEquipReply(ctx MessageContext, interaction
 	// can re-open a slot the prior occupant was holding.
 	var swappedBackName string
 	if prev, exists := equipped[mi.Slot]; exists && prev.Item.ID != "" {
-		back := magicItemSell(prev.Item)
+		back := magicItemSellAt(prev.Item, prev.Temper)
 		back.SkillSource = "magic_item:" + prev.Item.ID
 		if err := addAdvInventoryItem(ctx.Sender, back); err != nil {
 			return p.SendDM(ctx.Sender, "Failed to return your currently-equipped item to inventory.")
@@ -557,10 +641,10 @@ func (p *AdventurePlugin) resolveMagicEquipReply(ctx MessageContext, interaction
 			"user", ctx.Sender, "item", mi.ID, "err", err)
 		return p.SendDM(ctx.Sender, "Failed to equip that item.")
 	}
-	if err := equipMagicItem(ctx.Sender, mi.Slot, mi.ID, attune); err != nil {
+	if err := equipMagicItem(ctx.Sender, mi.Slot, mi.ID, attune, it.Temper); err != nil {
 		// Roll back: try to put the item back in inventory so the player
 		// doesn't lose it. Best-effort; log if the rollback also fails.
-		restored := magicItemSell(mi)
+		restored := magicItemSellAt(mi, it.Temper)
 		restored.Value = it.Value
 		restored.SkillSource = "magic_item:" + mi.ID
 		if rbErr := addAdvInventoryItem(ctx.Sender, restored); rbErr != nil {
@@ -570,9 +654,10 @@ func (p *AdventurePlugin) resolveMagicEquipReply(ctx MessageContext, interaction
 		return p.SendDM(ctx.Sender, "Failed to equip that item.")
 	}
 
+	eqMI := temperedItem(mi, it.Temper)
 	var sb strings.Builder
 	sb.WriteString(fmt.Sprintf("✨ **%s** equipped in your %s slot — %s.",
-		mi.Name, mi.Slot, magicItemEffectSummary(mi)))
+		eqMI.Name, eqMI.Slot, magicItemEffectSummary(eqMI)))
 	if swappedBackName != "" {
 		sb.WriteString(fmt.Sprintf("\n📦 **%s** moved back to inventory.", swappedBackName))
 	}
diff --git a/internal/plugin/magic_items_gameplay_test.go b/internal/plugin/magic_items_gameplay_test.go
index d141a7e..329be55 100644
--- a/internal/plugin/magic_items_gameplay_test.go
+++ b/internal/plugin/magic_items_gameplay_test.go
@@ -229,7 +229,7 @@ func TestSwapBackReturnsFullValue(t *testing.T) {
 	}
 
 	// Pre-occupy the slot with `a`, then drop `b` into inventory and equip it.
-	if err := equipMagicItem(user, a.Slot, a.ID, false); err != nil {
+	if err := equipMagicItem(user, a.Slot, a.ID, false, 0); err != nil {
 		t.Fatalf("seed equip: %v", err)
 	}
 	bInv := magicItemSell(b)
@@ -281,7 +281,7 @@ func TestEquippedMagicItemRoundTrip(t *testing.T) {
 		t.Skip("registry lacks both an attunement and a non-attunement slotted item")
 	}
 
-	if err := equipMagicItem(user, attItem.Slot, attItem.ID, true); err != nil {
+	if err := equipMagicItem(user, attItem.Slot, attItem.ID, true, 0); err != nil {
 		t.Fatalf("equip attunement item: %v", err)
 	}
 	// Equip the plain item into a distinct slot so it doesn't overwrite the
@@ -290,7 +290,7 @@ func TestEquippedMagicItemRoundTrip(t *testing.T) {
 	if plainSlot == attItem.Slot {
 		plainSlot = DnDSlotRing2
 	}
-	if err := equipMagicItem(user, plainSlot, plainItem.ID, false); err != nil {
+	if err := equipMagicItem(user, plainSlot, plainItem.ID, false, 0); err != nil {
 		t.Fatalf("equip plain item: %v", err)
 	}