Bluthtonite: I'm not sure, but I think I've found a bug in level 13, concerning the "secret" door. The one you're apparently supposed to open by activating the table-like thing in the room. Problem is, there's nothing to interact with there for me.
Would anyone be able to help me on this one? Is this a bug, or am I missing something? If it's a bug, is there a way around it?
http://guides.gamepressure.com/pillarsofeternity/guide.asp?ID=29967 Round room
Kill all enemies and ask the spirit about password to open the door (05). You can also check if you can find a switch in the middle of the room using sneak mode. It will move a fragment of the wall.
6. Round room
Kill the Caen Gwla creatures found in this room and once they're gone talk to a ghost. If you've decided to absorb Maerwald's door on the first level of the Endless Paths (M53,5) then you can ask the ghost for a password needed to open a door (M53,5). You can also press the platform found in the middle of the room to move a wall. This will unlock access to a secret chamber with two treasure chests.
I know I'm late to the party but hopefully this is helpful.