Plague Gas Lock
This iron door’s lock resembles a skull; the skull’s nose functions as the keyhole.
Attempting to pick the lock with thieves’ tools triggers Critical Failure. Any other method of opening the lock results in a Success. (As is the case with most locks, there is a decent chance the key is somewhere nearby!)
Exploration. An Engineering or Investigation check reveals that the keyhole is large enough to contain a trap. A Perception check or an examination of the floor reveals a drop of dried blood on the floor near the lock.
Lock. A creature can make an Investigation or thieves’ tools check to probe the lock for traps. This check is made with advantage . On a success, the creature identifies the trap and makes Dexterity checks to disable the trap with advantage. Failing the check triggers a Critical Failure.
The lock can be smashed with a DC 19 Strength check or by attacking it (AC 19, 20 hit points, immunity to poison and psychic damage).
Spell Solve. Knock unlocks the door but does not disable the trap.
- A creature can make a thieves’ tools check to disable the trap.
Potential Outcomes
Critical Failure. A 15-foot cone of diseased air blasts from the lock. Each creature in the area makes a Constitution saving throw . Creatures within 5 feet of the lock make this saving throw with disadvantage . On a failure, a creature takes 21 (6d6) necrotic damage and contracts slimy doom (see the contagion spell). On a success, the creature takes half damage and doesn’t contract the disease.
Failure. As a Critical Failure, except the cone of diseased air is 5 feet.
Success. The trap is disabled.
Critical Success. The trap is disabled, and the door is unlocked.