Dessicating Mist

You reach out with your magical senses to grip the water inside a creature within range, and begin to drain it from their body. Make a ranged spell attack against the creature. On a hit, the target takes 1d8 necrotic damage, and it can't regain hit points until the start of your next turn. Until then, the water forms a swirling mist around the creature before falling to the ground.

This spell's damage increases by 1d8 when you reach 5th level (2d8), 11th level (3d8), and 17th level (4d8).