01The keys are not interchangeable
This trips up more players than anything else in the item list. Blackmarrow Key, Blackwater Key, Crypt Key and Chapel Key each open one specific thing. Carrying the wrong one to a locked door does nothing.
| Key | Opens |
|---|---|
| Chapel Key | The chapel door to the Shrine of Trials route |
| Crypt Key | The Hall of Echoes dungeon in northern Fainweald |
| Blackmarrow Key | Shell Shade chests near the Marrow Keep elevator |
| Blackwater Key | TBC |
02Chapel Key
Found on an elevated stone altar just past the Sunken Crypt. To reach it, work through the eastern courtyard and climb the spiral stone stairs.
It unlocks the chapel door leading to the Shrine of Trials, near the Mushroom Village beacon.
03Crypt Key
Inside the only building in Desolate Peak — the one directly across from Baghead's throne, in the centre of the island.
It opens the entrance to the Hall of Echoes dungeon in the northern section of Fainweald. If you are already going to Desolate Peaks for the Baghead questline, grab this on the same trip.
04Blackmarrow Key
Blackmarrow Keys open the locked Shell Shade chests near the Marrow Keep elevator. Since Marrow Keep is your hub, these are easy to walk past repeatedly without realising what the chests need.
Sources checked
Facts on this page are cross-checked against the sources above. Anything the community has not settled is marked TBC rather than guessed.