Black Storm

You release a cacophony of negative energy that erupts from a point of your choice within range. Each creature in a 15-foot-radius sphere centered on that point must make a Constitution saving throw. A creature takes 2d6 necrotic and 2d6 thunder damage and is knocked prone on a failed save. On a successful save, the creature takes half as much damage and isn't knocked prone.

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, the damage increases by 1d6 for each slot level above 2nd.