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Exhaling PortalHazard 9

Legacy Content

Complex Magical Trap 
Source Dark Archive pg. 125
Complexity Complex
Stealth DC 33
Description Magic runes carved into a doorframe connect a door to the Plane of Air when opened, blowing creatures down the connecting hall.
Disable DC 30 Thievery (expert) twice to scratch out the runes, or dispel magic (5th level; counteract DC 30) to counteract the planar runes; DC 32 Athletics to shut the door if it's open (using Athletics only stops the trap, it doesn't fully disable it)
Gust [reaction] (air, conjuration) Trigger A creature opens the door; Effect The hall is buffeted by powerful winds for as long as the door remains open. A creature must succeed at a DC 32 Athletics check to move toward the door. A creature who fails at this check is pushed back 5 feet and falls prone.

Additionally, the triggering creature is blasted by a powerful gust of wind and must attempt a DC 32 Fortitude save. The trap then rolls initiative.

Critical Success The creature is unaffected.
Success The creature is pushed back 5 feet.
Failure The creature is pushed back 10 feet.
Critical Failure The creature is pushed back 10 feet and knocked prone.
Routine (1 action) The trap uses 1 action to blow powerful winds down the hall. Each creature in the hall must attempt a DC 32 Fortitude save with the same results as Gust. If this forced movement would cause a creature to collide with a solid object or fall downstairs or out a window, that creature takes an additional 2d10+11 bludgeoning damage (or 20 damage due to a fall).
Reset Automatic after the door is shut