Enervating Aura

As a bonus action, you shroud yourself in negative energy. Any creature that starts its turn within 10 feet of you must make a Constitution saving throw. A target takes 4d6 necrotic damage on a failed save, or half as much damage on a successful one.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the damage increases by 1d6 for each slot level above 3rd.