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From Pathfinder Adventures: Troubles in Grayce, which isn't enabled.

Collapsing Ceiling

HAZARD 4
Stealth +12 (trained)
Description 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.

Disable DC 21 Crafting (trained) to support the damaged area against a collapse


Falling Rocks
Trigger A creature enters a square where the ceiling's structure is weakened

Effect 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