diff --git a/internal/db/db.go b/internal/db/db.go
index 01dfa20..c47fc6b 100644
--- a/internal/db/db.go
+++ b/internal/db/db.go
@@ -1630,6 +1630,60 @@ CREATE TABLE IF NOT EXISTS dnd_zone_run (
 );
 CREATE INDEX IF NOT EXISTS idx_zone_run_active
     ON dnd_zone_run(user_id, completed_at, abandoned);
+
+-- ── D&D Layer (Phase 12 E1a — expeditions) ─────────────────────────────────
+-- A multi-day expedition wrapping a zone run. The expedition tracks
+-- real-world day count, supplies, camp state, threat clock, and zone-specific
+-- temporal stacks (heat / instability / time distortion). One active row
+-- per player (status='active'); enforced in code.
+--
+-- supplies_json:    serialized ExpeditionSupplies (current, max, daily_burn, harsh_mod, foraged_today)
+-- camp_json:        serialized *CampState (NULL when no camp pitched)
+-- threat_events:    serialized []ThreatEvent log
+-- region_state:     serialized region progression for Tier 4-5 zones (E4)
+CREATE TABLE IF NOT EXISTS dnd_expedition (
+    expedition_id    TEXT PRIMARY KEY,
+    user_id          TEXT NOT NULL,
+    zone_id          TEXT NOT NULL,
+    run_id           TEXT,                              -- FK-ish: dnd_zone_run.run_id
+    status           TEXT NOT NULL DEFAULT 'active',    -- active|extracting|complete|failed|abandoned
+    start_date       DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    current_day      INTEGER NOT NULL DEFAULT 1,
+    current_region   TEXT NOT NULL DEFAULT '',
+    boss_defeated    INTEGER NOT NULL DEFAULT 0,
+    supplies_json    TEXT NOT NULL DEFAULT '{}',
+    camp_json        TEXT,
+    threat_level     INTEGER NOT NULL DEFAULT 0,
+    threat_siege     INTEGER NOT NULL DEFAULT 0,
+    threat_events    TEXT NOT NULL DEFAULT '[]',
+    temporal_stack   INTEGER NOT NULL DEFAULT 0,        -- heat / instability / etc.
+    region_state     TEXT NOT NULL DEFAULT '{}',
+    xp_earned        INTEGER NOT NULL DEFAULT 0,
+    coins_earned     INTEGER NOT NULL DEFAULT 0,
+    gm_mood          INTEGER NOT NULL DEFAULT 50,
+    last_briefing_at DATETIME,
+    last_recap_at    DATETIME,
+    last_activity    DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    completed_at     DATETIME
+);
+CREATE INDEX IF NOT EXISTS idx_expedition_active
+    ON dnd_expedition(user_id, status);
+CREATE INDEX IF NOT EXISTS idx_expedition_run
+    ON dnd_expedition(run_id);
+
+-- One row per ExpeditionEntry (§9). Cheap to append; queried last-N for
+-- !expedition log and to reconstruct overnight events for morning briefings.
+CREATE TABLE IF NOT EXISTS dnd_expedition_log (
+    entry_id        INTEGER PRIMARY KEY AUTOINCREMENT,
+    expedition_id   TEXT NOT NULL,
+    day             INTEGER NOT NULL,
+    timestamp       DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    entry_type      TEXT NOT NULL,                      -- action|combat|rest|event|narrative|briefing|recap
+    summary         TEXT NOT NULL DEFAULT '',
+    flavor          TEXT NOT NULL DEFAULT ''
+);
+CREATE INDEX IF NOT EXISTS idx_expedition_log_recent
+    ON dnd_expedition_log(expedition_id, timestamp DESC);
 `
 
 // SeedSchedulerDefaults inserts default scheduler jobs if they don't exist.
diff --git a/internal/plugin/dnd_expedition.go b/internal/plugin/dnd_expedition.go
new file mode 100644
index 0000000..227dfd3
--- /dev/null
+++ b/internal/plugin/dnd_expedition.go
@@ -0,0 +1,421 @@
+package plugin
+
+import (
+	cryptorand "crypto/rand"
+	"database/sql"
+	"encoding/hex"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"time"
+
+	"gogobee/internal/db"
+	"maunium.net/go/mautrix/id"
+)
+
+// Phase 12 E1a — Expedition data model and persistence.
+// Implements `gogobee_expedition_system.md` §4.4 (Supplies), §5.3 (Camp),
+// §8.4 (Threat Clock), and §9 (Expedition State). One persisted Expedition
+// per active campaign; players may have at most one row with status='active'
+// (enforced in code).
+//
+// E1a ships the data layer only: structs, schema (in db.go), persistence
+// helpers, and a round-trip test. Day cycle (E1d), supply procurement (E1b),
+// commands (E1c), and camp interactions (E1e) wire on top in subsequent
+// commits. Threat clock events / siege mode are scaffolded but not driven
+// until E2.
+
+// Expedition status values.
+const (
+	ExpeditionStatusActive     = "active"
+	ExpeditionStatusExtracting = "extracting"
+	ExpeditionStatusComplete   = "complete"
+	ExpeditionStatusFailed     = "failed"
+	ExpeditionStatusAbandoned  = "abandoned"
+)
+
+// ExpeditionSupplies — §4.4.
+type ExpeditionSupplies struct {
+	Current       float32 `json:"current"`        // current SU
+	Max           float32 `json:"max"`            // purchased at outset
+	DailyBurn     float32 `json:"daily_burn"`     // base rate for this zone tier
+	HarshMod      float32 `json:"harsh_mod"`      // multiplier if harsh conditions active
+	ForagedToday  bool    `json:"foraged_today"`  // Ranger forage attempt used today
+	PacksStandard int     `json:"packs_standard"` // count purchased (max 3)
+	PacksDeluxe   int     `json:"packs_deluxe"`   // count purchased (max 1)
+}
+
+// CampState — §5.3.
+type CampState struct {
+	Active        bool      `json:"active"`
+	Type          string    `json:"camp_type"` // rough|standard|fortified|base
+	RoomIndex     int       `json:"room_index"`
+	EstablishedAt time.Time `json:"established_at"`
+	NightEvents   []string  `json:"night_events"`
+}
+
+// ThreatEvent — §8.4.
+type ThreatEvent struct {
+	Timestamp time.Time `json:"timestamp"`
+	Delta     int       `json:"delta"`
+	Reason    string    `json:"reason"`
+}
+
+// Expedition — §9. The in-memory shape of a dnd_expedition row.
+type Expedition struct {
+	ID             string
+	UserID         string
+	ZoneID         ZoneID
+	RunID          string // optional pointer to dnd_zone_run.run_id
+	Status         string
+	StartDate      time.Time
+	CurrentDay     int
+	CurrentRegion  string
+	BossDefeated   bool
+	Supplies       ExpeditionSupplies
+	Camp           *CampState
+	ThreatLevel    int
+	SiegeMode      bool
+	ThreatEvents   []ThreatEvent
+	TemporalStack  int
+	RegionState    map[string]any
+	XPEarned       int
+	CoinsEarned    int
+	GMMood         int
+	LastBriefingAt *time.Time
+	LastRecapAt    *time.Time
+	LastActivity   time.Time
+	CompletedAt    *time.Time
+}
+
+// IsActive reports whether the expedition is in flight.
+func (e *Expedition) IsActive() bool {
+	return e.Status == ExpeditionStatusActive || e.Status == ExpeditionStatusExtracting
+}
+
+// ExpeditionEntry — one row in dnd_expedition_log; mirrors §9.
+type ExpeditionEntry struct {
+	EntryID      int64
+	ExpeditionID string
+	Day          int
+	Timestamp    time.Time
+	Type         string
+	Summary      string
+	Flavor       string
+}
+
+// Errors returned by the expedition layer.
+var (
+	ErrExpeditionAlreadyActive = errors.New("expedition already active for player")
+	ErrNoActiveExpedition      = errors.New("no active expedition for player")
+)
+
+// newExpeditionID — 16-char hex token. Same scheme as zone runs.
+func newExpeditionID() string {
+	var b [8]byte
+	if _, err := cryptorand.Read(b[:]); err != nil {
+		// Vanishingly unlikely; fall through with a zeroed prefix.
+	}
+	return hex.EncodeToString(b[:])
+}
+
+// startExpedition creates a new expedition for the player. The caller must
+// have already validated zone access and supply purchase totals.
+// runID may be empty — the zone run is created lazily by E1c command flow.
+func startExpedition(userID id.UserID, zoneID ZoneID, runID string, supplies ExpeditionSupplies) (*Expedition, error) {
+	existing, err := getActiveExpedition(userID)
+	if err != nil {
+		return nil, err
+	}
+	if existing != nil {
+		return nil, ErrExpeditionAlreadyActive
+	}
+
+	now := time.Now().UTC()
+	exp := &Expedition{
+		ID:           newExpeditionID(),
+		UserID:       string(userID),
+		ZoneID:       zoneID,
+		RunID:        runID,
+		Status:       ExpeditionStatusActive,
+		StartDate:    now,
+		CurrentDay:   1,
+		Supplies:     supplies,
+		ThreatEvents: []ThreatEvent{},
+		RegionState:  map[string]any{},
+		GMMood:       50,
+		LastActivity: now,
+	}
+	supJSON, _ := json.Marshal(supplies)
+	regJSON, _ := json.Marshal(exp.RegionState)
+	threatJSON, _ := json.Marshal(exp.ThreatEvents)
+
+	if _, err := db.Get().Exec(`
+		INSERT INTO dnd_expedition
+			(expedition_id, user_id, zone_id, run_id, status,
+			 start_date, current_day, supplies_json,
+			 threat_events, region_state, gm_mood, last_activity)
+		VALUES (?, ?, ?, ?, 'active', ?, 1, ?, ?, ?, 50, ?)`,
+		exp.ID, exp.UserID, string(zoneID), nullableString(runID),
+		now, string(supJSON), string(threatJSON), string(regJSON), now,
+	); err != nil {
+		return nil, fmt.Errorf("insert expedition: %w", err)
+	}
+	return exp, nil
+}
+
+// getActiveExpedition returns the player's in-flight expedition, or (nil, nil).
+func getActiveExpedition(userID id.UserID) (*Expedition, error) {
+	row := db.Get().QueryRow(`
+		SELECT expedition_id, user_id, zone_id, run_id, status,
+		       start_date, current_day, current_region, boss_defeated,
+		       supplies_json, camp_json, threat_level, threat_siege,
+		       threat_events, temporal_stack, region_state,
+		       xp_earned, coins_earned, gm_mood,
+		       last_briefing_at, last_recap_at, last_activity, completed_at
+		  FROM dnd_expedition
+		 WHERE user_id = ?
+		   AND status IN ('active', 'extracting')
+		 ORDER BY start_date DESC
+		 LIMIT 1`, string(userID))
+	e, err := scanExpedition(row)
+	if errors.Is(err, sql.ErrNoRows) {
+		return nil, nil
+	}
+	return e, err
+}
+
+// getExpedition fetches by ID regardless of status. Test/admin use.
+func getExpedition(id string) (*Expedition, error) {
+	row := db.Get().QueryRow(`
+		SELECT expedition_id, user_id, zone_id, run_id, status,
+		       start_date, current_day, current_region, boss_defeated,
+		       supplies_json, camp_json, threat_level, threat_siege,
+		       threat_events, temporal_stack, region_state,
+		       xp_earned, coins_earned, gm_mood,
+		       last_briefing_at, last_recap_at, last_activity, completed_at
+		  FROM dnd_expedition WHERE expedition_id = ?`, id)
+	e, err := scanExpedition(row)
+	if errors.Is(err, sql.ErrNoRows) {
+		return nil, nil
+	}
+	return e, err
+}
+
+func scanExpedition(row scanner) (*Expedition, error) {
+	var (
+		e               Expedition
+		zoneID          string
+		runID           sql.NullString
+		suppliesJSON    string
+		campJSON        sql.NullString
+		threatJSON      string
+		regionJSON      string
+		bossI           int
+		siegeI          int
+		lastBriefingRaw sql.NullTime
+		lastRecapRaw    sql.NullTime
+		completedRaw    sql.NullTime
+	)
+	if err := row.Scan(
+		&e.ID, &e.UserID, &zoneID, &runID, &e.Status,
+		&e.StartDate, &e.CurrentDay, &e.CurrentRegion, &bossI,
+		&suppliesJSON, &campJSON, &e.ThreatLevel, &siegeI,
+		&threatJSON, &e.TemporalStack, &regionJSON,
+		&e.XPEarned, &e.CoinsEarned, &e.GMMood,
+		&lastBriefingRaw, &lastRecapRaw, &e.LastActivity, &completedRaw,
+	); err != nil {
+		return nil, err
+	}
+	e.ZoneID = ZoneID(zoneID)
+	if runID.Valid {
+		e.RunID = runID.String
+	}
+	e.BossDefeated = bossI != 0
+	e.SiegeMode = siegeI != 0
+	if err := json.Unmarshal([]byte(suppliesJSON), &e.Supplies); err != nil {
+		return nil, fmt.Errorf("decode supplies_json: %w", err)
+	}
+	if campJSON.Valid && campJSON.String != "" {
+		var c CampState
+		if err := json.Unmarshal([]byte(campJSON.String), &c); err != nil {
+			return nil, fmt.Errorf("decode camp_json: %w", err)
+		}
+		e.Camp = &c
+	}
+	if threatJSON != "" {
+		if err := json.Unmarshal([]byte(threatJSON), &e.ThreatEvents); err != nil {
+			return nil, fmt.Errorf("decode threat_events: %w", err)
+		}
+	}
+	if e.ThreatEvents == nil {
+		e.ThreatEvents = []ThreatEvent{}
+	}
+	if regionJSON != "" {
+		_ = json.Unmarshal([]byte(regionJSON), &e.RegionState)
+	}
+	if e.RegionState == nil {
+		e.RegionState = map[string]any{}
+	}
+	if lastBriefingRaw.Valid {
+		t := lastBriefingRaw.Time
+		e.LastBriefingAt = &t
+	}
+	if lastRecapRaw.Valid {
+		t := lastRecapRaw.Time
+		e.LastRecapAt = &t
+	}
+	if completedRaw.Valid {
+		t := completedRaw.Time
+		e.CompletedAt = &t
+	}
+	return &e, nil
+}
+
+// updateSupplies persists a new supplies snapshot.
+func updateSupplies(expID string, s ExpeditionSupplies) error {
+	b, _ := json.Marshal(s)
+	_, err := db.Get().Exec(`
+		UPDATE dnd_expedition
+		   SET supplies_json = ?,
+		       last_activity = CURRENT_TIMESTAMP
+		 WHERE expedition_id = ?`, string(b), expID)
+	return err
+}
+
+// updateCamp persists camp state. Pass nil to break camp.
+func updateCamp(expID string, c *CampState) error {
+	var arg any
+	if c == nil {
+		arg = nil
+	} else {
+		b, _ := json.Marshal(c)
+		arg = string(b)
+	}
+	_, err := db.Get().Exec(`
+		UPDATE dnd_expedition
+		   SET camp_json = ?,
+		       last_activity = CURRENT_TIMESTAMP
+		 WHERE expedition_id = ?`, arg, expID)
+	return err
+}
+
+// abandonExpedition flags the active expedition as abandoned. Idempotent.
+func abandonExpedition(userID id.UserID) error {
+	e, err := getActiveExpedition(userID)
+	if err != nil {
+		return err
+	}
+	if e == nil {
+		return ErrNoActiveExpedition
+	}
+	_, err = db.Get().Exec(`
+		UPDATE dnd_expedition
+		   SET status = 'abandoned',
+		       completed_at = CURRENT_TIMESTAMP,
+		       last_activity = CURRENT_TIMESTAMP
+		 WHERE expedition_id = ?`, e.ID)
+	return err
+}
+
+// completeExpedition marks the expedition complete (boss defeated or extracted).
+func completeExpedition(expID string, status string) error {
+	_, err := db.Get().Exec(`
+		UPDATE dnd_expedition
+		   SET status = ?,
+		       completed_at = CURRENT_TIMESTAMP,
+		       last_activity = CURRENT_TIMESTAMP
+		 WHERE expedition_id = ?`, status, expID)
+	return err
+}
+
+// applyThreatDelta clamps the threat level to [0,100], records the event,
+// and flips siege_mode when the level reaches 100.
+func applyThreatDelta(expID string, delta int, reason string) error {
+	e, err := getExpedition(expID)
+	if err != nil {
+		return err
+	}
+	if e == nil {
+		return ErrNoActiveExpedition
+	}
+	level := e.ThreatLevel + delta
+	if level < 0 {
+		level = 0
+	}
+	if level > 100 {
+		level = 100
+	}
+	siege := e.SiegeMode || level >= 100
+	events := append(e.ThreatEvents, ThreatEvent{
+		Timestamp: time.Now().UTC(),
+		Delta:     delta,
+		Reason:    reason,
+	})
+	eventsJSON, _ := json.Marshal(events)
+	_, err = db.Get().Exec(`
+		UPDATE dnd_expedition
+		   SET threat_level = ?,
+		       threat_siege = ?,
+		       threat_events = ?,
+		       last_activity = CURRENT_TIMESTAMP
+		 WHERE expedition_id = ?`,
+		level, boolToInt(siege), string(eventsJSON), expID)
+	return err
+}
+
+// advanceExpeditionDay bumps current_day by one. Real-time day cycle (E1d)
+// calls this from the 06:00 cron.
+func advanceExpeditionDay(expID string) error {
+	_, err := db.Get().Exec(`
+		UPDATE dnd_expedition
+		   SET current_day = current_day + 1,
+		       last_activity = CURRENT_TIMESTAMP
+		 WHERE expedition_id = ?`, expID)
+	return err
+}
+
+// appendExpeditionLog inserts one log entry.
+func appendExpeditionLog(expID string, day int, entryType, summary, flavor string) error {
+	_, err := db.Get().Exec(`
+		INSERT INTO dnd_expedition_log (expedition_id, day, entry_type, summary, flavor)
+		VALUES (?, ?, ?, ?, ?)`, expID, day, entryType, summary, flavor)
+	return err
+}
+
+// recentExpeditionLog returns the last `limit` entries, newest first.
+func recentExpeditionLog(expID string, limit int) ([]ExpeditionEntry, error) {
+	if limit <= 0 {
+		limit = 5
+	}
+	rows, err := db.Get().Query(`
+		SELECT entry_id, expedition_id, day, timestamp, entry_type, summary, flavor
+		  FROM dnd_expedition_log
+		 WHERE expedition_id = ?
+		 ORDER BY timestamp DESC, entry_id DESC
+		 LIMIT ?`, expID, limit)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+	var out []ExpeditionEntry
+	for rows.Next() {
+		var e ExpeditionEntry
+		if err := rows.Scan(
+			&e.EntryID, &e.ExpeditionID, &e.Day, &e.Timestamp,
+			&e.Type, &e.Summary, &e.Flavor,
+		); err != nil {
+			return nil, err
+		}
+		out = append(out, e)
+	}
+	return out, rows.Err()
+}
+
+func nullableString(s string) any {
+	if s == "" {
+		return nil
+	}
+	return s
+}
+
diff --git a/internal/plugin/dnd_expedition_test.go b/internal/plugin/dnd_expedition_test.go
new file mode 100644
index 0000000..1709dd2
--- /dev/null
+++ b/internal/plugin/dnd_expedition_test.go
@@ -0,0 +1,222 @@
+package plugin
+
+import (
+	"testing"
+
+	"gogobee/internal/db"
+	"maunium.net/go/mautrix/id"
+)
+
+func cleanupExpeditions(uid id.UserID) {
+	_, _ = db.Get().Exec(`DELETE FROM dnd_expedition_log
+		WHERE expedition_id IN (SELECT expedition_id FROM dnd_expedition WHERE user_id = ?)`,
+		string(uid))
+	_, _ = db.Get().Exec(`DELETE FROM dnd_expedition WHERE user_id = ?`, string(uid))
+}
+
+func TestStartExpedition_RoundTrip(t *testing.T) {
+	setupZoneRunTestDB(t)
+	uid := id.UserID("@exp-roundtrip:example.org")
+	defer cleanupExpeditions(uid)
+
+	supplies := ExpeditionSupplies{
+		Current:       10,
+		Max:           10,
+		DailyBurn:     1,
+		HarshMod:      1,
+		PacksStandard: 1,
+	}
+	exp, err := startExpedition(uid, ZoneGoblinWarrens, "", supplies)
+	if err != nil {
+		t.Fatalf("startExpedition: %v", err)
+	}
+	if exp.Status != ExpeditionStatusActive {
+		t.Errorf("status = %q", exp.Status)
+	}
+	if exp.CurrentDay != 1 {
+		t.Errorf("current_day = %d", exp.CurrentDay)
+	}
+	if !exp.IsActive() {
+		t.Error("expected IsActive")
+	}
+
+	got, err := getActiveExpedition(uid)
+	if err != nil || got == nil {
+		t.Fatalf("getActiveExpedition: %v / %v", got, err)
+	}
+	if got.ID != exp.ID {
+		t.Errorf("id mismatch")
+	}
+	if got.ZoneID != ZoneGoblinWarrens {
+		t.Errorf("zone = %s", got.ZoneID)
+	}
+	if got.Supplies.Current != 10 || got.Supplies.DailyBurn != 1 {
+		t.Errorf("supplies round-trip wrong: %+v", got.Supplies)
+	}
+	if got.GMMood != 50 {
+		t.Errorf("gm_mood = %d", got.GMMood)
+	}
+	if got.Camp != nil {
+		t.Errorf("expected no camp at start")
+	}
+}
+
+func TestStartExpedition_RejectsConcurrent(t *testing.T) {
+	setupZoneRunTestDB(t)
+	uid := id.UserID("@exp-concur:example.org")
+	defer cleanupExpeditions(uid)
+
+	if _, err := startExpedition(uid, ZoneGoblinWarrens, "", ExpeditionSupplies{Max: 5, Current: 5, DailyBurn: 1}); err != nil {
+		t.Fatal(err)
+	}
+	if _, err := startExpedition(uid, ZoneCryptValdris, "", ExpeditionSupplies{Max: 5, Current: 5, DailyBurn: 1}); err != ErrExpeditionAlreadyActive {
+		t.Errorf("err = %v, want ErrExpeditionAlreadyActive", err)
+	}
+}
+
+func TestExpedition_AbandonAndRestart(t *testing.T) {
+	setupZoneRunTestDB(t)
+	uid := id.UserID("@exp-abandon:example.org")
+	defer cleanupExpeditions(uid)
+
+	if _, err := startExpedition(uid, ZoneGoblinWarrens, "", ExpeditionSupplies{Max: 5, Current: 5, DailyBurn: 1}); err != nil {
+		t.Fatal(err)
+	}
+	if err := abandonExpedition(uid); err != nil {
+		t.Fatal(err)
+	}
+	got, err := getActiveExpedition(uid)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if got != nil {
+		t.Errorf("expected no active expedition after abandon, got %+v", got)
+	}
+	// Should be allowed to start again now.
+	if _, err := startExpedition(uid, ZoneGoblinWarrens, "", ExpeditionSupplies{Max: 5, Current: 5, DailyBurn: 1}); err != nil {
+		t.Errorf("expected restart allowed, got %v", err)
+	}
+}
+
+func TestExpedition_UpdateSuppliesAndCamp(t *testing.T) {
+	setupZoneRunTestDB(t)
+	uid := id.UserID("@exp-update:example.org")
+	defer cleanupExpeditions(uid)
+
+	exp, err := startExpedition(uid, ZoneGoblinWarrens, "", ExpeditionSupplies{Max: 10, Current: 10, DailyBurn: 1})
+	if err != nil {
+		t.Fatal(err)
+	}
+	exp.Supplies.Current = 7.5
+	if err := updateSupplies(exp.ID, exp.Supplies); err != nil {
+		t.Fatal(err)
+	}
+	camp := &CampState{Active: true, Type: "standard", RoomIndex: 2}
+	if err := updateCamp(exp.ID, camp); err != nil {
+		t.Fatal(err)
+	}
+	got, err := getActiveExpedition(uid)
+	if err != nil || got == nil {
+		t.Fatalf("get: %v / %v", got, err)
+	}
+	if got.Supplies.Current != 7.5 {
+		t.Errorf("supplies.current = %v", got.Supplies.Current)
+	}
+	if got.Camp == nil || got.Camp.Type != "standard" || got.Camp.RoomIndex != 2 {
+		t.Errorf("camp = %+v", got.Camp)
+	}
+	// Break camp.
+	if err := updateCamp(exp.ID, nil); err != nil {
+		t.Fatal(err)
+	}
+	got, _ = getActiveExpedition(uid)
+	if got.Camp != nil {
+		t.Errorf("expected camp nil after break, got %+v", got.Camp)
+	}
+}
+
+func TestExpedition_ThreatDeltaAndSiege(t *testing.T) {
+	setupZoneRunTestDB(t)
+	uid := id.UserID("@exp-threat:example.org")
+	defer cleanupExpeditions(uid)
+
+	exp, err := startExpedition(uid, ZoneGoblinWarrens, "", ExpeditionSupplies{Max: 5, Current: 5, DailyBurn: 1})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if err := applyThreatDelta(exp.ID, 30, "test bump"); err != nil {
+		t.Fatal(err)
+	}
+	if err := applyThreatDelta(exp.ID, 80, "siege test"); err != nil {
+		t.Fatal(err)
+	}
+	got, _ := getExpedition(exp.ID)
+	if got.ThreatLevel != 100 {
+		t.Errorf("threat = %d, want clamped to 100", got.ThreatLevel)
+	}
+	if !got.SiegeMode {
+		t.Error("expected siege mode at 100")
+	}
+	if len(got.ThreatEvents) != 2 {
+		t.Errorf("threat_events len = %d, want 2", len(got.ThreatEvents))
+	}
+	// Negative delta clamps to 0.
+	if err := applyThreatDelta(exp.ID, -200, "reset"); err != nil {
+		t.Fatal(err)
+	}
+	got, _ = getExpedition(exp.ID)
+	if got.ThreatLevel != 0 {
+		t.Errorf("threat after negative delta = %d", got.ThreatLevel)
+	}
+	// Siege mode is sticky once tripped.
+	if !got.SiegeMode {
+		t.Error("expected siege mode to remain set")
+	}
+}
+
+func TestExpedition_LogAppendAndRecent(t *testing.T) {
+	setupZoneRunTestDB(t)
+	uid := id.UserID("@exp-log:example.org")
+	defer cleanupExpeditions(uid)
+
+	exp, err := startExpedition(uid, ZoneGoblinWarrens, "", ExpeditionSupplies{Max: 5, Current: 5, DailyBurn: 1})
+	if err != nil {
+		t.Fatal(err)
+	}
+	for i := 1; i <= 7; i++ {
+		if err := appendExpeditionLog(exp.ID, i, "action", "advance", "TwinBee notes."); err != nil {
+			t.Fatal(err)
+		}
+	}
+	entries, err := recentExpeditionLog(exp.ID, 5)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(entries) != 5 {
+		t.Fatalf("entries = %d", len(entries))
+	}
+	if entries[0].Day != 7 {
+		t.Errorf("newest day = %d, want 7", entries[0].Day)
+	}
+}
+
+func TestExpedition_AdvanceDay(t *testing.T) {
+	setupZoneRunTestDB(t)
+	uid := id.UserID("@exp-day:example.org")
+	defer cleanupExpeditions(uid)
+
+	exp, err := startExpedition(uid, ZoneGoblinWarrens, "", ExpeditionSupplies{Max: 5, Current: 5, DailyBurn: 1})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if err := advanceExpeditionDay(exp.ID); err != nil {
+		t.Fatal(err)
+	}
+	if err := advanceExpeditionDay(exp.ID); err != nil {
+		t.Fatal(err)
+	}
+	got, _ := getExpedition(exp.ID)
+	if got.CurrentDay != 3 {
+		t.Errorf("current_day = %d, want 3", got.CurrentDay)
+	}
+}