Collapsing Ceiling
HAZARD 4 +12 (trained)
A 5-foot-square section in the ceiling is in danger of collapsing. A character can use a Crafting check instead of a Perception check to detect the hazard.
DC 21 Crafting (trained) to support the damaged area against a collapse
Falling Rocks
A creature enters a square where the ceiling's structure is weakened
Rocks fall in the square, dealing 4d8+10 bludgeoning damage (DC 25 basic Reflex save) to anyone in that square. The square also turns into greater difficult terrain.
Pathfinder Adventures: Troubles in GrayceORC