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Acid MistHazard 6

Uncommon Complex Magical Trap 
Source Pathfinder #215: To Blot Out the Sun pg. 34
Complexity Complex
Stealth +10 (trained)
Description A golden guardrail sprays magical, flesh-eating acid throughout the stairwell.
Disable Thievery DC 26 (expert) to deactivate the trap’s sensors, or Arcana DC 24 (expert) to disrupt the guardrail’s magic, or dispel magic (3rd rank; counteract DC 24) to counteract the guardrail
AC 21, Fort +17, Ref +11
Guardrail Hardness 13, Guardrail HP 56 (BT 28); Immunities critical hits, object immunities, precision damage
Spray Acid [reaction] (acid, arcane); Trigger A creature steps on the south stairs; Effect The guardrail sprays flesh-eating acid, filling the entire stairwell. All living creatures on the stairs area take 2d8+9 acid damage (DC 27 basic Reflex save). The trap then rolls initiative.
Routine (1 action) On its initiative, the trap continues to spray acid, dealing 2d8+9 acid damage to all living creatures on the stairs (DC 25 basic Reflex save).
Reset The trap automatically deactivates after 1 minute. It resets in 1 hour.