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Venom PoolHazard 18

Legacy Content

Uncommon Complex Environmental 
Source Pathfinder #174: Shadows of the Ancients pg. 11
Complexity Complex
Stealth +30 (legendary) to distinguish between the hazard and the oozes within it; DC 0 to notice the pool
Description A shallow, foul-smelling puddle of toxic acid blocks a narrow hall, and poison bursts from it when disturbed.
Disable DC 40 Crafting (master) or DC 42 Survival (legendary) to neutralize the acid while within reach of it. Three successes using either skill (or a combination of both) destroys the hazard.
Deadly Footing The area of the venom pool is difficult terrain, and each creature moving through it takes 10 acid damage for every square of its area that it moves into.
Poison Puff [reaction] Trigger A creature moves through any square in the hazard's space; Effect The pool produces a 9th-level cloudkill (DC 40) at its center. It then rolls initiative.
Routine (2 actions) The hazard uses its first action to spread 10 feet down the hallway in both directions. Once out of the hall, each side spreads in a random direction each round, but they don't go through doors. The hazard uses its second action to move the center of the cloudkill up to 20 feet in any direction to which any part of the pool has line of effect (normally, to encompass the greatest number of characters). If the cloudkill isn't present, it instead uses its second action to produce a new cloudkill, as Poison Puff.
Reset The hazard ends after 1 minute, contracting to its original size and keeping still until disturbed again.