Desiccate

You destroy up to 10 gallons of water within range. Alternatively, you destroy fog in a 30-foot Cube within range. If used against a creature, the creature must make a CON save or take 3d8 necrotic damage as the water inside them is destroyed. Constructs and Undead take no damage.

Using a Higher-Level Spell Slot. You destroy 10 additional gallons of water, or the size of the Cube increases by 5 feet, for each spell slot level above 3. Add 1d8 for each spell slot level above 3.