Mortal Shell II: All Dungeon Locations
Every optional overworld dungeon in Mortal Shell II, organized by hub and zone. Includes key requirements, lock types, and the dungeons players most commonly miss.
Mortal Shell II
~37 Optional Dungeons
None Missable
Fainweald + Mammon
Goal: Find and clear all optional overworld dungeons in Mortal Shell II. These are the short elevator/fog-gate side holes that hold weapons, sidearms, Tarstones, and upgrades. They are not the six Corrupted Gate story zones (Glutted Mire, Sanguine Caverns, Prisoners' Domain, Conquered Temple, Withered Shoals, Faded Citadel) and not the Unfound Path endgame. None are missable; you can finish them all after the final boss before NG+.
What to Do First
- Manually mark each dungeon complete after clearing it.The game only auto-marks an icon after you enter the fog gate once. Hover and confirm on the map to track progress.
- Treat Marrow Keep as a dungeon hub, not just a rest spot.The hidden Desolate Keep is underneath it.
- Farm keys as you explore: Crypt Key, Chapel Key, Light Keys, Slayer Seal.Several "missing" dungeons are just locked rooms behind these keys.
- After unlocking Fainweald and Mammon, sweep beacon to beacon.Do not just follow the golden story path. Players who only follow story gates miss half the list.
Key Items You Need
Crypt Key
Opens several locked dungeon rooms. Grab it before the mid-game sweep.
Chapel Key
Unlocks chapel-type dungeons in Fainweald and Mammon.
Light Keys
Required for multiple sealed entrances. Farm as you progress.
Slayer Seal
Opens chalice/gate dungeons that do not respond to hidden walls.
1Marrow Keep (Hub)
1Marrow KeepHidden under hub
- Desolate KeepIn the room with Sester Genessa, face away from her. Hit the wall with the white symbol. Break all four chains around the chalice, then interact to "commune with chaos." After beating at least one main boss, it teleports you into the dungeon. Drops a Blackmarrow Key used for Shell skins. Not a starter dungeon despite being under the hub.
Common mistake: Treating Desolate Keep as easy hub content. It is a near 1:1 of Doom E1M1 and the first rooms are decent early Gloom farms, but it is not a starter dungeon. Do not skip the hidden lever, courtyard, and Grisha shortcut inside.
2Early Fainweald (Widow's Overlook to Nochtean Gate)
2Early FainwealdSoutheast cluster
- Martyr's TombSoutheast of Widow's Overlook Beacon. Past three cultists, left into the ruined building.
- Ritual Grounds
- Coward's Retreat
- Crumbling Tunnel
- Shattered Beacon
- Knight's Crypt
- Flooded Village
- Shrine of Trials
- Holding CellsWell in Blackridge Hamlet. Clear barrels and Tarred Corpses first. Bridges Blackridge and Gloomshade. Hard early boss (Rabid Grisha Pack). One of the first "this is actually hard" dungeons.
- Thieves Retreat
- Ravaged Tomb
- Disciple's Stash
- Waterfall Camp
3Mid Fainweald (Gloomshade to Disciple's Grotto)
3Mid FainwealdCentral to north
- Illusionist's CacheStone structure on Desolate Peak. Elevator down. Pressure-plate and block puzzle. Crypt Key is on the back table before you drop in.
- Martyr's Prison
- Ravaged Hideout
- Deserted Mine
- Grisha Hunting Grounds
- Hall of Echoes
- Feeding Grounds
- Overrun Quarry
- Smuggler's Hideout
- Hag's Pit
- Revered Beacon
- Alchemist's Workshop
- Blackwell Cavern
- Hall of Murmurs
- Chamber of Becoming
- Parasitic Stash
- Bellkeeper's Corner
- Collapsed Mine
- Obsidianite Mines
- Spoiled MortuaryEasy last miss. Left of Sentry's Grave, just north of the square-tower silhouette on the map.
- Sentry's Grave
- Besieged Ruins
- Garrick's DenFrom Disciple's Grotto Beacon, go left.
Most-missed dungeon: Spoiled Mortuary. It sits in a dead-looking pocket next to Sentry's Grave. Players assume the area is empty and move on. Check the left side of Sentry's Grave, north of the square-tower silhouette.
4Mammon (South)
4MammonSouth region
- Sweep every ruined building, well, mine mouth, and bone-gate side path.Check near Sester's Retreat, Silent Steps, Abandoned Outpost, High Lord's Courtyard.
Note: Forgotten Tower is a separate puzzle site (glands), not the same as a standard loot dungeon. It has its own mechanics and does not count toward the optional dungeon sweep.
Key Decision Points
- Enter now vs later: Holding Cells, Desolate Keep, and anything with a named mini-boss can wreck an under-upgraded Shell. If you only want the map mark, dip through the fog so it registers, then leave and come back later.
- Key vs smash: If a chalice or gate does not respond, you probably need Slayer Seal, Crypt Key, Chapel Key, or a Light Key, not a hidden wall. Do not waste time slapping every brick first.
- Story gates vs side holes: If the area has its own internal beacons (Sunken Village, Hangman's Scaffold, Citadel Annex, etc.), it is a legacy/story dungeon. Optional dungeons are the short elevator drops off the overworld.
Common Mistakes
- Waiting for icons to appear before exploring. They will not. The map only marks a dungeon after you enter the fog gate once.
- Assuming Desolate Keep gives Sester Genessa's Shell. It does not. Her Shell is a separate overworld/sidequest find.
- Skipping Spoiled Mortuary. It sits in a dead-looking pocket next to Sentry's Grave and is the most commonly missed dungeon.
- Treating the Doom keep as easy hub content. Commenters warn it is not. Bring an upgraded Shell.
- Farming only story bosses and wondering why weapon/sidearm counts are short. Most of those sit in the optional holes, not the story zones.
Full All-Dungeons Walkthrough
Use the in-game map mark after each fog gate so you do not reclear the same copy-paste layout three times.