Eldritch Explosion

A sphere of crackling energy streaks toward a creature within range. Make a ranged spell attack against a target within range that you can see. On a hit, the target takes 3d6 force damage and is knocked prone.  Hit or miss, the sphere then explodes. The target and each creature within 10 feet of it must succeed on a Dexterity saving throw or take 6d6 force damage and be knocked prone, or half as much damage on a successful save and are not knocked prone.

The blast spreads around corners. Any nonmagical object that isn't being worn or carried is pushed out of the spells area of effect.

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.