Greater Water to Poison
5th-level transmutation (Artificer,Bard,Druid,Ranger,Sorcerer,Warlock,Wizard)
- Casting Time: 1 action
- Range: 30 feet
- Components: V, S, M (a serpent's tooth)
- Duration: Concentration, up to 1 minute
You transform any large quantity of water within a 10-foot cube centered on a point you choose into a deadly poison. This spell only affects bodies of water of at least 10 gallons or more within the affected area, not separate smaller quantities of water. It can also be liquid that is mostly water (such as blood, sewage, or wine), but a living creature's vital fluids cannot be affected. Any creature with its head or one of its breathing passages (such as a humanoid's nose or mouth) currently submerged into water you have transformed with this spell must make a make a Constitution saving throw at the beginning of any turn in which they are so submerged.
On a failure, the creature is poisoned for the duration, and they take 4d8 poison damage. If the creature fails the saving throw by 5 or more, its Constitution score is reduced by 1d4. On a success, the creature can choose to spit the water out and take no damage, or continue to swallow it and take half damage. If the creature failed its save, at the start of each of the creature's turns before the spell ends, it must succeed on a Constitution saving throw or take 3d10 poison damage. On a successful save, the spell ends.
Creatures who do not need to save against the spell but who are within 5 feet of the transformed water can use an action to apply poison to one weapon, piece of ammunition, or portion of food or drink. Once applied, the poison retains potency for the duration of the spell or until someone must save against it. If a creature is struck with the poisoned weapon or ammunition, or if it ingests the poisoned food or drink, it must make a Constitution save or be poisoned for the duration and take 1d8 poison damage, or 2d8 if the poison is ingested. If the creature fails the saving throw by 5 or more, its Constitution score is reduced by 1d4. Creatures that succeed on their save take half damage, but suffer no other effects.
At Higher Levels. When you cast this spell using a spell slot of 6th level or higher, you can affect one additional creature who is drinking at the same time, and the damage increases by 1d8 for each slot level above 5th.