From Pathfinder Adventure: Troubles in Otari, which isn't enabled.

Collapsing Porch

HAZARD 1

Stealth +9 (or 0 after the hazard is triggered)

Description A section of splintery and rotten floorboards drop a creature 6 feet onto uneven rocks and piercing shards of wood.

Disable DC 15 Crafting (trained) to replace or cover the weak sections of flooring, or DC 15 Survival (trained) to crumble the rotten floorboards from a safe distance

AC 10; Fort +1, Ref +1

Hardness 3, HP 12 (BT 6); Immunities critical hits, precision

Collapse

If a creature walks on the area marked on the map, it falls through the weakened floorboards onto uneven rocks and sharp shards of wood, taking 1d4 piercing damage and 1d6 bludgeoning damage. The creature can use the Grab an Edge reaction to avoid the fall and the damage.

Reset Once this section of the porch has collapsed, creatures can still fall through the hole until the porch is Repaired.

Pathfinder Adventure: Troubles in OtariOGL