From Pathfinder Society Scenario #5-16: A Lie Told to Strangers, which isn't enabled.

Collapsing Debris

HAZARD 1

Stealth +7 (trained) to notice the instability in the surrounding woodwork and precariously balanced masonry.

Description The room initially appears merely dilapidated, but on closer inspection it is positively liable to collapse at any moment.

Disable DC 20 Crafting (untrained) to safely shore up the weaknesses in the masonry by replacing rotten wood with other assorted bric-a-brac, DC 17 Thievery (trained) to carefully place boards and the like to create bridges over structurally weak areas.

Collapse

Trigger A creature moves into the hazardous area

Effect Bricks and broken wood fall on the triggering creature, dealing 2d6+5 bludgeoning damage (DC 19 basic Reflex save).

Pathfinder Society Scenario #5-16: A Lie Told to StrangersOGL