J3 D10: T4/T5 anchor-room variety (2nd elite + trap per zone)

In-place node kind swaps on fork branches — no node added/removed, longest
path unchanged — adding one Elite + one Trap of anchor variety to each T4/T5
zone, placed to keep fork-choice risk/loot asymmetric:

  underdark   +Elite drow_gate (R2->R4 region-guardian)  +Trap silenced_chamber
  feywild     +Elite singing_orchard (grove branch)      +Trap mire_steps (marsh)
  dragons_lair+Elite coin_strewn_hall (treasure spur)    +Trap hidden_passage (hoard spur)
  abyss_portal+Elite wardens_hall (R3 guardian)          +Trap hush_corridor, seam_threshold

abyss_portal shipped with zero trap nodes; D10 gives it two. A/B sim corpus
(n=480/side): boss-clear flat (+1.5pp aggregate, per-cell within n=15 noise),
median day-counts stable, combats/run rose where anchors hit common paths.
New Test*Graph_*Anchors tests lock the per-zone trap/elite counts.

internal/plugin/zone_graph_abyss_portal.go

@@ -56,6 +56,18 @@ package plugin
 // Longest entry→boss walk: 10 (R1) + 10 (R2) + 10 (R3) + 10 (R4) = 40
 // nodes, inside [36, 44]. All four meaningful walks (fork1 × fork2 ×
 // capstone) hit the same node count by construction.
+//
+// D10 anchor variety (in-place kind swaps, no length change): the Abyss
+// shipped with NO trap node and only the fork2 vrock ELITE, so D10 adds
+// two traps and a region-guardian elite —
+//   - Hush Corridor (fork1 silent_chambers Perception-loot spur) and
+//     Seam Threshold (fork3 reality_seam SECRET spur) become TRAPs, so
+//     the two loot/secret branches each carry a hazard.
+//   - Warden's Hall (R3 wardens_post buildup, main path) becomes an
+//     ELITE — the region literally named for its wardens finally has
+//     one, giving every walk a mid-zone region-guardian.
+// The burning_wastes / mind_corridor / void_charge / usurper_throne
+// routes stay clean, preserving the safe-vs-loot fork trade-off.
 
 func zoneAbyssPortalGraph() ZoneGraph {
 	r1 := "abyss_outer_rift"
@@ -96,7 +108,7 @@ func zoneAbyssPortalGraph() ZoneGraph {
 
 		{NodeID: "abyss_portal.silent_chambers", Kind: NodeKindExploration, RegionID: r2,
 			Label: "Silent Chambers", PosX: 10, PosY: 3},
-		{NodeID: "abyss_portal.hush_corridor", Kind: NodeKindExploration, RegionID: r2,
+		{NodeID: "abyss_portal.hush_corridor", Kind: NodeKindTrap, RegionID: r2,
 			Label: "Hush Corridor", PosX: 11, PosY: 3},
 		{NodeID: "abyss_portal.listening_room", Kind: NodeKindExploration, RegionID: r2,
 			Label: "Listening Room", PosX: 12, PosY: 3},
@@ -135,7 +147,7 @@ func zoneAbyssPortalGraph() ZoneGraph {
 		// R3 buildup to fork3.
 		{NodeID: "abyss_portal.wardens_outer_post", Kind: NodeKindExploration, RegionID: r3,
 			Label: "Outer Warden Post", PosX: 23, PosY: 2},
-		{NodeID: "abyss_portal.wardens_hall", Kind: NodeKindExploration, RegionID: r3,
+		{NodeID: "abyss_portal.wardens_hall", Kind: NodeKindElite, RegionID: r3,
 			Label: "Warden's Hall", PosX: 24, PosY: 2},
 		{NodeID: "abyss_portal.wardens_chapel", Kind: NodeKindExploration, RegionID: r3,
 			Label: "Warden's Chapel", PosX: 25, PosY: 2},
@@ -163,7 +175,7 @@ func zoneAbyssPortalGraph() ZoneGraph {
 		{NodeID: "abyss_portal.claimed_path", Kind: NodeKindExploration, RegionID: r4,
 			Label: "Claimed Path", PosX: 32, PosY: 2},
 
-		{NodeID: "abyss_portal.seam_threshold", Kind: NodeKindExploration, RegionID: r4,
+		{NodeID: "abyss_portal.seam_threshold", Kind: NodeKindTrap, RegionID: r4,
 			Label: "Seam Threshold", PosX: 30, PosY: 3},
 		{NodeID: "abyss_portal.reality_seam", Kind: NodeKindSecret, RegionID: r4,
 			Label: "Reality Seam", PosX: 31, PosY: 3,

internal/plugin/zone_graph_abyss_portal_test.go

@@ -119,3 +119,34 @@ func TestAbyssPortalGraph_RealitySeamHighestBias(t *testing.T) {
 		t.Errorf("reality_seam LootBias = %v, want >= 3.0 (Abyss capstone)", seam.Content.LootBias)
 	}
 }
+
+// TestAbyssPortalGraph_D10Anchors verifies the D10 anchor-variety pass.
+// The Abyss shipped with no Trap node and a single fork2 Elite, so D10
+// adds two branch Traps (Hush Corridor, Seam Threshold) and a main-path
+// region-guardian Elite (Warden's Hall). Counts: 2 traps, 2 elites.
+func TestAbyssPortalGraph_D10Anchors(t *testing.T) {
+	g := zoneAbyssPortalGraph()
+	var trapCount, eliteCount int
+	for _, n := range g.Nodes {
+		switch n.Kind {
+		case NodeKindTrap:
+			trapCount++
+		case NodeKindElite:
+			eliteCount++
+		}
+	}
+	if trapCount != 2 {
+		t.Errorf("trap nodes = %d, want 2 (D10 hush_corridor + seam_threshold)", trapCount)
+	}
+	if eliteCount != 2 {
+		t.Errorf("elite nodes = %d, want 2 (vrock_aerie + D10 wardens_hall)", eliteCount)
+	}
+	if g.Nodes["abyss_portal.wardens_hall"].Kind != NodeKindElite {
+		t.Error("D10: wardens_hall (R3 region-guardian) should be an Elite")
+	}
+	for _, id := range []string{"abyss_portal.hush_corridor", "abyss_portal.seam_threshold"} {
+		if g.Nodes[id].Kind != NodeKindTrap {
+			t.Errorf("D10: %s should be a Trap", id)
+		}
+	}
+}

internal/plugin/zone_graph_dragons_lair.go

@@ -52,6 +52,17 @@ package plugin
 // Longest entry→boss walk: 10 (R1) + 10 (R2) + 9 (R3) + 10 (R4) = 39
 // nodes, inside [36, 44]. The two R2 spurs and three R4 capstones each
 // reach the boss in the same node count by construction.
+//
+// D10 anchor variety (in-place kind swaps, no length change): the two
+// loot-leaning branches each gain a guard, so "the richer route costs
+// more" —
+//   - Coin-Strewn Hall (treasure_vault spur) becomes an ELITE; the
+//     Perception loot route is now guarded, mirroring the ash_bridge
+//     spur's TRAP so both fork1 branches carry an anchor.
+//   - Hidden Passage (hoard_pillar SECRET capstone spur) becomes a
+//     TRAP guarding the densest loot in the zone.
+// The direct-confrontation and dragon-bargain routes stay clean, so the
+// fork choice trades safety for loot.
 
 func zoneDragonsLairGraph() ZoneGraph {
 	r1 := "dragons_lair_kobold_warrens"
@@ -110,7 +121,7 @@ func zoneDragonsLairGraph() ZoneGraph {
 		{NodeID: "dragons_lair.treasure_vault", Kind: NodeKindExploration, RegionID: r2,
 			Label: "Treasure Vault", PosX: 17, PosY: 2,
 			Content: ZoneNodeContent{LootBias: 1.5}},
-		{NodeID: "dragons_lair.coin_strewn_hall", Kind: NodeKindExploration, RegionID: r2,
+		{NodeID: "dragons_lair.coin_strewn_hall", Kind: NodeKindElite, RegionID: r2,
 			Label: "Coin-Strewn Hall", PosX: 18, PosY: 2},
 		{NodeID: "dragons_lair.vault_passage", Kind: NodeKindExploration, RegionID: r2,
 			Label: "Vault Passage", PosX: 19, PosY: 2},
@@ -152,7 +163,7 @@ func zoneDragonsLairGraph() ZoneGraph {
 			Label: "Audience Hall", PosX: 31, PosY: 1},
 
 		// R4 hoard_pillar spur (Perception 17, SECRET).
-		{NodeID: "dragons_lair.hidden_passage", Kind: NodeKindExploration, RegionID: r4,
+		{NodeID: "dragons_lair.hidden_passage", Kind: NodeKindTrap, RegionID: r4,
 			Label: "Hidden Passage", PosX: 29, PosY: 2},
 		{NodeID: "dragons_lair.hoard_pillar", Kind: NodeKindSecret, RegionID: r4,
 			Label: "Hidden Hoard Pillar", PosX: 30, PosY: 2,

internal/plugin/zone_graph_dragons_lair_test.go

@@ -111,3 +111,32 @@ func TestDragonsLairGraph_LootBiasEscalation(t *testing.T) {
 		t.Errorf("hoard_pillar LootBias = %v, want >= 2.5 (T5 secret)", hoard.Content.LootBias)
 	}
 }
+
+// TestDragonsLairGraph_D10Anchors verifies the D10 anchor-variety pass:
+// the treasure_vault spur gains a guarding Elite (Coin-Strewn Hall) to
+// mirror the ash_bridge spur's Trap, and the hoard_pillar SECRET capstone
+// spur gains a Trap (Hidden Passage). Counts: 2 traps, 2 elites.
+func TestDragonsLairGraph_D10Anchors(t *testing.T) {
+	g := zoneDragonsLairGraph()
+	var trapCount, eliteCount int
+	for _, n := range g.Nodes {
+		switch n.Kind {
+		case NodeKindTrap:
+			trapCount++
+		case NodeKindElite:
+			eliteCount++
+		}
+	}
+	if trapCount != 2 {
+		t.Errorf("trap nodes = %d, want 2 (ash_bridge + D10 hidden_passage)", trapCount)
+	}
+	if eliteCount != 2 {
+		t.Errorf("elite nodes = %d, want 2 (wyrmlings_nest + D10 coin_strewn_hall)", eliteCount)
+	}
+	if g.Nodes["dragons_lair.coin_strewn_hall"].Kind != NodeKindElite {
+		t.Error("D10: coin_strewn_hall (treasure_vault spur) should be an Elite")
+	}
+	if g.Nodes["dragons_lair.hidden_passage"].Kind != NodeKindTrap {
+		t.Error("D10: hidden_passage (hoard_pillar spur) should be a Trap")
+	}
+}

internal/plugin/zone_graph_feywild_crossing.go

@@ -18,6 +18,16 @@ package plugin
 // Also new: cursed_thicket TRAP anchor in the preamble — every walk
 // hits it. The original G8f graph had no Trap node.
 //
+// D10 anchor variety (in-place kind swaps, no length change): the two
+// first-stage approaches each gain one distinct anchor so the fork
+// choice carries a flavor, not just a skill gate —
+//   - Grove approach: Singing Orchard becomes an ELITE (the CHA-bonus
+//     route is guarded; you pay for the bargain in blood).
+//   - Marsh approach: Mire Steps becomes a TRAP (the free route is
+//     hazardous footing rather than a fight).
+// The time_eddy / illusion_garden exclusive endings stay anchor-light so
+// they keep their "skip the hag elite for loot" trade-off.
+//
 //   Preamble (10 nodes, ending in fork1):
 //     entry → twilight_path → veiled_glade → faerie_lights →
 //     cursed_thicket (TRAP) → revel_road → moonshadow_bridge →
@@ -87,7 +97,7 @@ func zoneFeywildCrossingGraph() ZoneGraph {
 			Label: "Grove Threshold", PosX: 10, PosY: 0},
 		{NodeID: "feywild_crossing.starlight_path", Kind: NodeKindExploration,
 			Label: "Starlight Path", PosX: 11, PosY: 0},
-		{NodeID: "feywild_crossing.singing_orchard", Kind: NodeKindExploration,
+		{NodeID: "feywild_crossing.singing_orchard", Kind: NodeKindElite,
 			Label: "Singing Orchard", PosX: 12, PosY: 0},
 		{NodeID: "feywild_crossing.mirror_pond", Kind: NodeKindExploration,
 			Label: "Mirror Pond", PosX: 13, PosY: 0},
@@ -109,7 +119,7 @@ func zoneFeywildCrossingGraph() ZoneGraph {
 			Label: "Fog Basin", PosX: 12, PosY: 4},
 		{NodeID: "feywild_crossing.moaning_reeds", Kind: NodeKindExploration,
 			Label: "Moaning Reeds", PosX: 13, PosY: 4},
-		{NodeID: "feywild_crossing.mire_steps", Kind: NodeKindExploration,
+		{NodeID: "feywild_crossing.mire_steps", Kind: NodeKindTrap,
 			Label: "Mire Steps", PosX: 14, PosY: 4},
 		{NodeID: "feywild_crossing.submerged_stones", Kind: NodeKindExploration,
 			Label: "Submerged Stones", PosX: 15, PosY: 4},

internal/plugin/zone_graph_feywild_crossing_test.go

@@ -93,6 +93,8 @@ func TestFeywildCrossingGraph_FirstCHALock(t *testing.T) {
 
 // TestFeywildCrossingGraph_TrapAnchor verifies D1-d added the missing
 // Trap node. Original G8f graph had elite/secret but no trap.
+// TestFeywildCrossingGraph_TrapAnchor verifies the preamble trap plus
+// the D10 marsh-branch trap (Mire Steps).
 func TestFeywildCrossingGraph_TrapAnchor(t *testing.T) {
 	g := zoneFeywildCrossingGraph()
 	var trapCount int
@@ -101,8 +103,30 @@ func TestFeywildCrossingGraph_TrapAnchor(t *testing.T) {
 			trapCount++
 		}
 	}
-	if trapCount != 1 {
-		t.Errorf("trap nodes = %d, want 1", trapCount)
+	if trapCount != 2 {
+		t.Errorf("trap nodes = %d, want 2 (cursed_thicket + D10 mire_steps)", trapCount)
+	}
+	if g.Nodes["feywild_crossing.mire_steps"].Kind != NodeKindTrap {
+		t.Error("D10: mire_steps (marsh branch) should be a Trap")
+	}
+}
+
+// TestFeywildCrossingGraph_EliteAnchors verifies the shared hag_circle
+// elite plus the D10 grove-branch elite (Singing Orchard), so the first
+// fork carries a per-branch anchor (grove=elite, marsh=trap).
+func TestFeywildCrossingGraph_EliteAnchors(t *testing.T) {
+	g := zoneFeywildCrossingGraph()
+	var eliteCount int
+	for _, n := range g.Nodes {
+		if n.Kind == NodeKindElite {
+			eliteCount++
+		}
+	}
+	if eliteCount != 2 {
+		t.Errorf("elite nodes = %d, want 2 (hag_circle + D10 singing_orchard)", eliteCount)
+	}
+	if g.Nodes["feywild_crossing.singing_orchard"].Kind != NodeKindElite {
+		t.Error("D10: singing_orchard (grove branch) should be an Elite")
 	}
 }
 

internal/plugin/zone_graph_underdark.go

@@ -51,6 +51,16 @@ package plugin
 //
 // Trap anchor (Collapsed Arch) is new — the original G8i graph had no
 // Trap node. Placed in the R1 preamble so every walk hits it.
+//
+// D10 anchor variety (in-place kind swaps, no length change):
+//   - Silenced Chamber (R3 illithid arm) becomes a TRAP — the second
+//     trap, on a fork branch so the illithid route reads riskier than
+//     the drow route.
+//   - Drow Gate Garrison (R2 arm tail, at the R2→R4 boundary) becomes a
+//     region-guardian ELITE, giving the drow arm two elites (Captain +
+//     Garrison) and the multi-region transition a teeth-y interrupt.
+// The deep_chasm spur stays anchor-light (harvest, no second trap/elite)
+// so the CON-gated climb keeps its "denser loot, less fighting" identity.
 
 func zoneUnderdarkGraph() ZoneGraph {
 	r1 := "underdark_surface_tunnels"
@@ -111,15 +121,15 @@ func zoneUnderdarkGraph() ZoneGraph {
 			Label: "Drow Descent", PosX: 17, PosY: 0},
 		{NodeID: "underdark.drow_passage", Kind: NodeKindExploration, RegionID: r2,
 			Label: "Lower Passage", PosX: 18, PosY: 0},
-		{NodeID: "underdark.drow_gate", Kind: NodeKindExploration, RegionID: r2,
-			Label: "Drow Gate", PosX: 19, PosY: 0},
+		{NodeID: "underdark.drow_gate", Kind: NodeKindElite, RegionID: r2,
+			Label: "Drow Gate Garrison", PosX: 19, PosY: 0},
 
 		// R3 illithid_warren arm.
 		{NodeID: "underdark.psionic_corridor", Kind: NodeKindExploration, RegionID: r3,
 			Label: "Psionic Corridor", PosX: 8, PosY: 2},
 		{NodeID: "underdark.whispering_hall", Kind: NodeKindExploration, RegionID: r3,
 			Label: "Whispering Hall", PosX: 9, PosY: 2},
-		{NodeID: "underdark.silenced_chamber", Kind: NodeKindExploration, RegionID: r3,
+		{NodeID: "underdark.silenced_chamber", Kind: NodeKindTrap, RegionID: r3,
 			Label: "Silenced Chamber", PosX: 10, PosY: 2},
 		{NodeID: "underdark.mind_tank_room", Kind: NodeKindExploration, RegionID: r3,
 			Label: "Brine Tanks", PosX: 11, PosY: 2},

internal/plugin/zone_graph_underdark_test.go

@@ -106,8 +106,8 @@ func TestUnderdarkGraph_AllArmsReachBoss(t *testing.T) {
 	}
 }
 
-// TestUnderdarkGraph_TrapAnchor verifies D1-d added the missing Trap
-// node. Original G8i graph had elite/boss/harvest but no trap.
+// TestUnderdarkGraph_TrapAnchor verifies D1-d added the missing R1 Trap
+// (collapsed_arch) and D10 added the illithid-arm Trap (silenced_chamber).
 func TestUnderdarkGraph_TrapAnchor(t *testing.T) {
 	g := zoneUnderdarkGraph()
 	var trapCount int
@@ -116,7 +116,30 @@ func TestUnderdarkGraph_TrapAnchor(t *testing.T) {
 			trapCount++
 		}
 	}
-	if trapCount != 1 {
-		t.Errorf("trap nodes = %d, want 1", trapCount)
+	if trapCount != 2 {
+		t.Errorf("trap nodes = %d, want 2 (collapsed_arch + D10 silenced_chamber)", trapCount)
+	}
+	if g.Nodes["underdark.silenced_chamber"].Kind != NodeKindTrap {
+		t.Error("D10: silenced_chamber (illithid arm) should be a Trap")
+	}
+}
+
+// TestUnderdarkGraph_EliteAnchors verifies the per-arm elites (drow
+// Captain, illithid Mind Flayer) plus the D10 region-guardian elite at
+// the drow→throne boundary (drow_gate), so the drow arm carries two
+// elites while the chasm spur stays anchor-light.
+func TestUnderdarkGraph_EliteAnchors(t *testing.T) {
+	g := zoneUnderdarkGraph()
+	var eliteCount int
+	for _, n := range g.Nodes {
+		if n.Kind == NodeKindElite {
+			eliteCount++
+		}
+	}
+	if eliteCount != 3 {
+		t.Errorf("elite nodes = %d, want 3 (drow_captain + mind_flayer + D10 drow_gate)", eliteCount)
+	}
+	if g.Nodes["underdark.drow_gate"].Kind != NodeKindElite {
+		t.Error("D10: drow_gate (R2→R4 boundary) should be a region-guardian Elite")
 	}
 }