Eldritch Detonation

The caster builds up Eldritch energy inside themselves and releases it from themselves as a wave in all directions. Each creature in a 10-foot-radius sphere centered on that point must make a Constitution saving throw. A creature takes 3d8 force damage on a failed save, or half as much damage on a successful one. If a creature the same size or smaller than the caster fails its save, it is also pushed back 5ft and is now prone.

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, the damage increases by 1d8 for each slot level above 2nd.