T3 zone, fifth authored graph. Shape: five-node linear preamble
(sealed_gate → forge_descent → cooling_river → magma_chamber elite)
followed by a single 3-way antechamber fork before the boss.
Bends the plan §G8 "two forks for T2+" guideline to a single late
fork-with-three-options because the gauntlet shape is the design
intent — Kharak Dûn is a one-way descent. Triple-option antechamber
(direct / DEX-checked catwalks / Perception-found forge_vault secret)
preserves agency at the commitment moment.
Map renders as a long horizontal stem with a 3-leaf fan at the right
edge — visually distinct from any earlier zone.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
