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Avalanche DoorsHazard 4

Legacy Content

Uncommon Mechanical Trap 
Source Crown of the Kobold King pg. 80
Complexity Simple
Stealth DC 22 (expert)
Description The double door is a false door; when triggered, the door slams downward like a drawbridge to crush anyone standing before it.
Disable DC 22 Thievery (trained) to detach the trigger from the doors and lock them in place
AC 21, Fort +14, Ref +8
Hardness 11, HP 50 (BT 25); Immunities critical hits, object immunities, precision damage
Topple Forward [reaction] Trigger Someone attempts to open the doors, or the doors take enough damage to become broken; Effect The heavy metal doors are spring-loaded to slam downward, dropping like a drawbridge to smash all creatures in a 10-foot-square before the doors. All creatures in this area must attempt a DC 21 Reflex save.

Critical Success The creature lurches to the side and takes no damage—move the creature to a square of the creature's choice adjacent to the trap's area of effect.
Success The creature takes 3d8 bludgeoning damage and is pushed into an adjacent square just outside the trap's area.
Failure The creature takes 6d8 bludgeoning damage, is pushed into an adjacent square just outside the trap's area, and falls prone in that square.
Critical Failure The creature takes 12d8 bludgeoning damage and is knocked prone. The heavy doors pin the creature to the ground, Immobilizing it (Escape DC 22). A non-immobilized character can lift the doors by Forcing them open with a successful DC 22 Athletics check so that an immobilized character can crawl to safety.