OOC:
@annex could you help me understand what are you referring to with "a maul-shaped hole in the ceiling". I don't recognize narrating any hole.
If you refer to " Zean smashes his maul into the ceiling to realize it's a solid stone block " - that smashing made no visible damage to the huge stone block. If anything it would be the maul to break, not a solid stone.
[ +- ] Stone coffin
I would imagine something like this
For simplicity let's say any stone coffin can be opened by two characters combined effort (no roll required). You would stone lid off the coffin unless it is locked in any way - but you would only learn about it once two PCs try to take the lid off