From Pathfinder Kingmaker, which isn't enabled.

Collapsing Floor

HAZARD 20

Stealth +38

Description The westernmost 5 feet of the building gives way, dropping rubble and anyone in the area into the depths of the Lantern Kingdom below.

Disable DC 51 Thievery to quickly jury-rig key supports against weak wall sections to prevent the collapse

Collapse

Trigger A Small or larger creature walks into either 5-foot-square at the westernmost end of the building

Effect The triggering creature falls and takes 50 bludgeoning damage, then an additional 10d6 bludgeoning damage as they and the building's falling timbers "land" in a devastating crash at area A1. The creature can use the Grab an Edge reaction to avoid falling.

Pathfinder KingmakerOGL