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Hardened EntryHazard 18

Uncommon Complex Mechanical Trap 
Source Claws of the Tyrant pg. 68
Complexity Complex
Stealth +35 (master)
Description A portcullis drops from the ceiling, landing with a heavy thunk. Seconds later, a cloud of acid rises from a metal grate in the floor.
Disable DC 45 Athletics to prevent the portcullis from dropping, DC 48 Crafting (master) to create a compound to neutralize the cloud of acid, or DC 35 Thievery (expert) to jam the pressure plate
AC 42, Fort +33, Ref +27
Hardness 29, HP 110 (BT 55); Immunities critical hits, object immunities, precision damage
Falling Portcullis [reaction] Trigger A creature Strides beneath the portcullis while it is raised; Effect The portcullis slams down, driving its sharpened ends through a grate in the floor. Creatures directly beneath the portcullis take 3d12+20 piercing damage (DC 40 basic Reflex save). The portcullis is made of adamantine and has Hardness 31 and 120 HP (BT 60). The trap then rolls initiative.
Routine (1 action) A cloud of acidic vapor rises from the grate beneath the portcullis in a 5-foot emanation. Any creature that enters the area or starts its turn inside the cloud takes 3d12+20 acid damage (DC 40 basic Fortitude save). A creature that critically fails the save also takes 1d12 persistent acid damage. Each time the hazard uses this routine beyond the first, increase the radius of the emanation by 5 feet.
Reset Once triggered, the trap must be manually reset by raising the portcullis. Once all the vials are smashed, the trap can’t use its routine again until the vials are replaced.