Dessicate

You destroy the water inside a creature.

You destroy up to 8 liters of water in each creature in a cube 10 by 10 feet within range. 

Roll a D8 to determine how many liters of water are destroyed.  For each liter, the target or targets take 1D6 necrotic damage.

Target makes a CON saving throw, taking half damage on a successful saving throw.

At Higher Levels. When you cast this spell using a spell slot of 6th level or higher, you destroy 8 additional liters of water, in a cube 10 by 10 feet, for each slot level above 5th.

Roll a D8 for each spell level at 5th level or higher to determine how many liters of water are destroyed.