Mortal Shell 2 Illusionist's Cache Puzzle Walkthrough
Updated August 24, 2026 · Checked for the current launch build
Quick answer: The dungeon is in the ruin opposite Baghead's throne. Take the Crypt Key off the shelf before you ride down. Clear the priests, get a pillar onto the pressure plate so the hole stops mattering, open the chest for Shuddering Stone, then drop the side elevator for Ventrium and Laterite.
Official promotional screenshot: Steam / Cold Symmetry / Playstack
Location and preparation
RegionWestern Fainweald — Desolate Peak
Nearest landmarkDesolate Peak, opposite Baghead
Before enteringBone Gate from the Citadel / Gloomshade cliffs. Crypt Key is on the entrance shelf, not inside.
Complete route
- Reach Desolate Peak via the cliff Bone Gate below the Citadel of Penance.
- Enter the ruined building opposite Baghead. Take the Crypt Key and the follower note from the table or shelf above the elevator before you descend.
- Ride the elevator into a narrow tunnel. Two priest enemies hold the dead end — clear them before you start moving architecture.
- The puzzle is a pillar and a pressure plate around a hole. Get the pillar onto the plate so the gap is no longer the thing you have to stand on.
- Enter the newly opened room and open the chest for Shuddering Stone (projectiles generate a knockback shockwave on impact).
- Use the elevator beside the stairs, kill the snake nested below, and pick up Ventrium and Laterite.
- Ride back out. The Crypt Key is spent later at Hall of Echoes in northeast Fainweald, not on this peak.
Puzzle and stuck-point decoder
| What is stopping you | What to do | How to confirm it worked |
|---|---|---|
| The tunnel looks like a dead end | Clear the two priests, then look for the movable pillar and plate rather than a second fog door | A hole / plate room is visible past the fight |
| You fall through the hole when you leave the plate | Push or strike the pillar onto the pressure plate | The new room stays accessible without your weight |
| The chest room feels empty | Open the chest, then take the side elevator down | Shuddering Stone plus Ventrium and Laterite are in inventory |
Loot checklist
| Reward | Where it is | Why it matters |
|---|---|---|
| Crypt Key | Shelf / table above the entrance elevator | Opens Hall of Echoes in northeast Fainweald |
| Shuddering Stone | Chest after the pillar sits on the plate | Sidearm / projectile knockback Tarstone |
| Ventrium and Laterite | Lower elevator, after the snake | Tarforge upgrade materials |
Before you leave
- The Crypt Key is easy to ride past. Take it before the first elevator.
- GameRant's write-up is the complete puzzle source used here. If a later patch changes the plate, trust the room in front of you over this page.
- Baghead's throne is outside, not part of the dungeon. Do not start his empty-handed ending until you want the joke credits.
Sources
Related guides
All dungeon locations · Interactive map checklist · Key locations · Desolate Peak · Baghead
Frequently asked questions
Where is Illusionist's Cache?
Desolate Peak, in the ruin directly opposite Baghead's throne. Arrive by the Bone Gate below the Citadel of Penance.
What is the Illusionist's Cache puzzle?
A pillar must sit on a pressure plate so a hole no longer blocks the chest room. Then loot Shuddering Stone and take the side elevator for upgrade ores.
Is the Crypt Key inside the dungeon?
No. It is on the shelf or table above the entrance elevator. Hall of Echoes is the door it actually opens.
Evidence: Routes and rewards are synthesized from the current walkthroughs linked on this page and cross-checked where a second source exists. Promotional images illustrate the game's dungeon environments; they are not turn-by-turn map screenshots. Reviewed August 24, 2026.