Dehydrate

You attempt to destroy the moisture within a huge or smaller creature within range. The creature must make a Constitution saving throw. This spell does not affect undead, and plants and water elementals make this saving throw with disadvantage. On a failed save, a creature takes 3d8 necrotic damage and has disadvantage on their next attack roll, ability check, or saving throw. On a successful save, the creature takes half as much damage and suffers no additional affects.
A nonmagical plant targeted by this spell, such as a small tree or shrub, wither and die instantly.

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, the damage increases by 1d8 for each slot level above 2nd.