Toxin Well

4th-level transmutation

Classes: Bard, sorcerer, warden, wizard
Casting Time: 1 action
Range: Touch
Components: V, S, M (a vial of poison)
Duration: 1 hour

You touch a body of water no greater than 120 gallons, causing it to become toxic and take on an oily, murky haze as you infuse it with magical poison for the duration. This water can be used on its own, or can be mixed with other fluids (such as potions) in equal parts; the other fluid keeps its original properties, and is additionally poisoned according to the effects of this spell. The poisoned fluid affects targets in the following ways.

Contact. When a creature starts its turn with any part of its body, such as a limb or appendage, in contact with the water, it must succeed on a Constitution saving throw or become poisoned for 1 minute.

Dip. If you submerge an object, such as a weapon or piece of cloth, in this liquid, it becomes infused with the magic toxin. Any creature touched with the toxin-infused surface within the next round must succeed on a Constitution saving throw or become poisoned until the end of its next turn.

Drink. When a creature drinks this water, it immediately becomes poisoned and must make a Constitution saving throw, taking 5d6 poison damage on a failed save or half as much damage on a successful one.

Steam. If at least 10 gallons of this water are vaporized, such as by being brought to a boil, the steam lingers as a poisonous cloud for the duration. The size of the cloud is a cylinder, 5 feet tall and with a 5-foot radius, centered above the original source. When a creature starts its turn in contact with this cloud, it must make a Constitution saving throw. On a failed save, the creature spends its action that turn retching and reeling. Creatures that don’t need to breathe or are immune to poison automatically succeed on this saving throw. A moderate wind (at least 10 miles per hour) disperses the cloud after 4 rounds. A strong wind (at least 20 miles per hour) disperses it after 1 round.