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Collapsing VestibuleHazard 16

Complex Magical Trap 
Source A Vast Abyss Above pg. 75
Complexity Complex
Stealth +32 (master)
Description A weak point in the barrier between the Universe and the Plane of Earth compromises the stability of the entire chamber.
Disable DC 36 Arcana or Nature (expert) twice to seal the rift between planes, or DC 34 Stealth to pass through the chamber without triggering the trap
Rockfall [reaction] Trigger A creature enters area E2 or fails an Arcana or Nature check to disable the trap; Effect The ceiling of the chamber partially collapses. Each creature in the area takes 3d12+18 bludgeoning damage (DC 37 basic Reflex save) from falling rubble. On a critical failure, the creature also falls prone and is restrained (Escape DC 37) as it is pinned beneath a rock. The hazard then rolls initiative.
Routine (2 actions) The hazard uses each of its actions to summon an elite stone mauler (Pathfinder Monster Core 6, 143). Once the hazard has summoned a total of three stone maulers, it can’t summon another until the hazard resets. Alternatively, the hazard can use one of its actions to reassemble a mauler that has been reduced to 0 Hit Points. A reassembled stone mauler appears in the space it was destroyed with 100 Hit Points and is stunned 1. If the trap is disabled, any summoned stone maulers disappear as they return to the Plane of Earth.
Reset Once all creatures have left the area, the hazard deactivates and the stone maulers disappear, but the hazard resets after 1 minute.

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