8th-level necromancy
Casting Time 1 action
Range 150 feet
Components V S M (Sponge)
Duration Instantaneous

Every creature in a 30-foot cube makes a Constitution save. On a failure, they have 12d8 necrotic damage. On a success, they take half as much. Constructs and undead are immune to this spell, and plants and water elementals have disadvantage on the save. Nonmagical plants that aren't creatures wither instantly.