The Drunken Lizard Pub

There's a gate that's closed at the northeast portion of the Ossuary; I can even see a poltergeist beyond it. I've tried all the levers I could find around that dungeon but none seem to work and the tile on the floor right in front of that gate makes a faint click but nothing happens...

could someone give me a clue?

Is this where the three caskets are? Or where the four empty boxes are?

If the latter, read the plaques behind the boxes.

If the former, the switch is up in the northwest corner.

If neither of the above, it's multiple switches.

thanks! yeah it's the four chests. i'm really bad with riddles...

Just check the "unofficial FAQ" if you really don't want to struggle.