From Pathfinder Kingmaker, which isn't enabled.

Weakened Floor

HAZARD 5

Stealth +16 (expert)

Description A section of the cave floor collapses under a creature, plunging it 40 feet into a chasm filled with jagged stalactites.

Disable DC 20 Survival to knock loose the unstable floor and reveal a traversable ledge to the south.

Floor Collapse

Trigger A Small or larger creature enters the marked portion of the map

Effect The triggering creature falls, taking 20 damage from the fall plus 3d6 piercing damage (DC 22 basic Reflex) from the stalagmites. A creature can Grab an Edge to avoid falling, or succeed at a DC 20 Athletics check to climb out of the chasm.

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