Breath of Broken Trap
This trap activates when a creature steps on a hidden pressure plate at the spot marked “X” on the map, releasing poisonous gas into the maze from hundreds of narrow vents hidden throughout the chamber. The gas lightly obscures the chamber and disperses after 1 minute. At the start of its turn, if a creature is in the gas, it must succeed on a DC 14 Constitution saving throw or be poisoned until the start of its next turn.
Prevention. A successful DC 20 Wisdom (Perception) check sees an off-center tile that conceals the pressure plate. Wedging an iron spike or other object under the pressure plate prevents the trap from activating.