From Pathfinder Adventure Path: Hellbreakers, which isn't enabled.

Falling Crates

HAZARD 3

Stealth +10 (trained)

Description A tower of precariously stacked crates is rigged to fall when someone steps through a trip wire.

Disable DC 17 Thievery (trained) to carefully remove the trip wire.

Tumble Down

Trigger A creature trips the wire

Effect Several heavy crates come crashing down in the 10-foot square area marked on the map, dealing 2d10+10 bludgeoning damage to each creature in that area (DC 20 basic Reflex save). A creature who critically fails the save is knocked Prone.

Pathfinder Adventure Path: HellbreakersORC