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Mortal Shell 2 Prisoners' Domain Walkthrough

Quick answer: Prisoners' Domain is the third Fainweald gate. Push the dungeon to Captives End and fight The Nameless Captive as a parry / Perfect Guard exam. Bring the Untarnished Seal if you still need Peter's Perfect Parry — that trophy is missable on this fight.
Mortal Shell II melee boss dungeon

Official promotional screenshot: Steam / Cold Symmetry / Playstack

Route

  1. Enter the Prisoners' Domain Corrupted Gate in Fainweald. This is a melee corridor, not a swamp.
  2. Cleanse Beacons as you descend. The last Beacon appears after the boss.
  3. Optional 1 Glimpse summon: Eredrim.
  4. Fight at arena center so the camera can see every sword cue. Red attacks are unparryable. Full plan: Nameless Captive guide.

Trophy warning

Peter's Perfect Parry wants the Untarnished Seal and all seven hits of the qualifying phase-two headspin. A normal clear can ignore the windmill and back out. A trophy clear cannot. Do not equip Slayer Seal on this save if you still want achievements.

Related guides

Nameless Captive · How to parry · Missable trophies · Citadel of Penance

Evidence: Dungeon endpoint and trophy caveat follow this site's Nameless Captive page and PowerPyx's missable list. Verified August 23, 2026.