Toxic Furnace
COMPLEX HAZARD 6 +15 (expert)
The smoking furnace begins to hiss and click, and its vents swivel and adjust to spew toxic fumes in the direction of intruders.
DC 25 Thievery (trained) to render one of the vents useless, or DC 25 Athletics to wrench and bend a vent until it no longer functions
AC 24; Fort +17, Ref +11
Hardness 15, HP 56 (BT 28) Furnace BT 28, Vent Hardness 10, Vent HP 18 (BT 9); Immunities critical hits, precision
Spew Toxins
A visible living creature enters the room, or a Stealthy creature fails to remain Hidden from the toxic furnace with a DC 25 Stealth check (the trap's sensors have darkvision and lifesense);
One of the toxic furnace's vents swivels to aim at the triggering creature and then spews a gout of boiling toxin at the target. The toxic furnace then rolls initiative.
Melee Boiling Toxin +17, Damage 1d6 acid plus 2d6 fire plus 2d6 poison
(3 actions) The trap loses 1 action for each disabled vent. On each of the trap's actions, a vent spews a gout of boiling toxin at a living creature in sight of it. It can't target a single creature more than once per round, so if there aren't enough viable targets for all 3 actions, the trap loses those unspent actions.
The trap resets after 1 minute, during which it sees no creatures to target.
Pathfinder Adventure: Crown of the Kobold KingOGL