From Pathfinder Society Special #3-98: Expedition Into Pallid Peril, which isn't enabled.

Unstable Column (3-4)

HAZARD 2

MECHANICAL TRAP

Stealth +10 (trained)

Description Plaster crumbles from this column moments before it collapses.

Disable DC 18 Crafting (trained) to stabilize the column, DC 21 Athletics to push the column back into place

AC 18; Fort +12, Ref +5

Hardness 7, HP 30 (BT 15)

Collapse

Trigger A creature steps on the tiles adjacent to the column

Effect The column collapses. The triggering creature must attempt a DC 18 basic Reflex save as debris falls on them, which deals 2d10+7 bludgeoning damage. The area adjacent to the collapsed column becomes difficult terrain.

Pathfinder Society Special #3-98: Expedition Into Pallid PerilOGL