Mind-Cloud Gas Trap

Mechanical trap

When a creature steps on a hidden pressure plate, small slits open in the plate and shoot a colorless gas that has a very faint smell of insect pheromones upwards, onto the skin and clothing of any creatures within 5’ of the trap that have at least 3 Intelligence.

Those creatures must make a DC 16 Constitution saving throw. Any creature that fails this save becomes affected by the gas for 2D6 x 5 minutes or until they bathe or are otherwise submerged in water.

The gas manifests to affected creatures as the voice of someone they trust, respect, or obey. Only they can hear it, but it seems perfectly normal to them. They must make a DC 12 Wisdom saving throw immediately upon failing the initial Constitution save, and every 10 minutes after that, until they fail the save. An affected creature that fails this Wisdom save will behave in one of the following ways (determined at random):

Wait – the creature refuses to move, believing the person whose voice they heard is coming to find them bearing important tidings, and if they stray from the spot they stand on, that person will be unable to find them. Flee – the creature believes a great danger is present or near, and flees toward a safe location to the best of their ability, disregarding their surroundings. Fight – the creature grows hostile and suspicious, and will attack any creatures it can detect with lethal force, including any offensive spells or ability it possesses.

Once an affected creature fails this Wisdom save once, it behaves accordingly for the duration of the gas. Once the gas wears off, the affected creature has disadvantage on Wisdom ability checks and saving throws for an amount of time equal to how long the gas affected them. Only after this period can they realize they were hallucinating.