pf2e.fyi
From Pathfinder #181: Zombie Feast, which isn't enabled.

Bursting Bone Vault

HAZARD 3
Stealth +13 (trained)
Description This bone-filled vault disgorges its contents the moment the vault door slides open.

Disable DC 20 Thievery (trained) or DC 20 Stealth (trained) to carefully open the vault door without disturbing the bones

AC 10
HP 10 (BT 5)

Collapse
Trigger A creature opens the door to the vault

Effect The bones spill from the vault and into the adjacent corridor, dealing 2d10+13 bludgeoning damage to each creature within 10 feet of the door (DC 20 basic Reflex). The area becomes difficult terrain.
Pathfinder #181: Zombie FeastOGL