Crushing Gate Trap
HAZARD 16 +32 DC 42 Perception (master) to spot the triggering rod beneath the black sand.
A hidden stone rod causes two immense stone doors to fall forward from their gate, crushing anything beneath them. The doors also fall forward if touched.
DC 42 Thievery (expert) to secure the doors in place without triggering the trap
AC 40; Fort +32, Ref +25
Hardness 26, HP 104 (BT 52); Immunities critical hits, precision
Gate Collapse (attack)
The stone rod is moved or either door is touched
The two falling doors deal 6d12+35 bludgeoning damage (DC 37 basic Reflex save) to all creatures within 15 feet of the gate. On a failure, a creature is also pinned beneath the door and Immobilized until the door is moved (DC 34 Athletics) or destroyed; each door has the same AC, Fortitude save, Hardness, and Hit Points as the trap itself. On a critical failure, the creature is trapped in such a way that it can't attempt to free itself. Moving or destroying one door doesn't help free anyone trapped by the other door.
Pathfinder #155: Lord of the Black SandsOGL