Both T4 zones follow the D1-a/b/c pattern: extend the graph so the
longest entry→boss walk lands in band, keep the zone's authored
topology intact.
underdark (T4): 10 → 46 nodes, longest 30 (band 28-34)
feywild_crossing (T4): 9 → 53 nodes, longest 30 (band 28-34)
Topology preserved per zone:
- Underdark: 4-region authoring intact (every node carries a valid
RegionID); 3-way fork1 (drow R2 / illithid R3 / deep_chasm R1)
with LockNone / LockPerception / LockStatCheck CON; deep_chasm
intentionally stays R1; all three arms converge at the R4
throne_approach merge. Adds the missing Trap anchor (Collapsed
Arch) in the R1 preamble.
- Feywild Crossing: woven forks intact — hag_circle still has two
incoming edges (one per first-stage path), time_eddy stays
grove-exclusive, illusion_garden stays marsh-exclusive, fork1
remains CHA-vs-Perception with no LockNone option. Adds the
missing Trap anchor (Cursed Thicket) and a fae_court MERGE so
the three second-stage endings converge into one final boss
approach instead of triplicating it.
MinRooms/MaxRooms re-pitched 8-10 → 28-34 so the dice fallback also
lands in band for any future graphless variant.
T5 zones (dragons_lair, abyss_portal) deferred to D1-e — those
need a RegionID backfill on top of the length extension since their
regionsByZone entries are not currently honored by their graphs.
T4 zone, ninth (final) authored graph. Shape: 3-way regional fork
where each arm crosses a different region boundary, all converging at
R4 (deep_throne). First and only authored zone where every node
carries a non-empty RegionID matching dnd_expedition_region.go.
Three arms from fork1:
- R1→R2 drow_patrol → drow_captain (elite)
- R1→R3 psionic_corridor → mind_flayer (elite)
- R1→R1 deep_chasm (CON-gated harvest, stays in surface_tunnels)
…all converging at R4 throne_approach → boss.
Exercises G6 fireGraphRegionTransition end-to-end: edges crossing
region boundaries fire the transition hook (updates Expedition
.CurrentRegion, marks region visited, writes a transit log entry)
without burning supplies or advancing the day, since the graph is
the run state.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
