Bubble Burst

A bubble forms at a point of your choice within range, rapidly expanding until it bursts with a loud pop and enough force to knock down a large creature. Each creature in a 10-foot-radius sphere centered on that point must make a Strength saving throw. A creature takes 2d8 force damage and is knocked prone (if they are of medium or smaller size) on a failed save, or half as much damage and not knocked prone on a successful one.

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, the damage increases by 1d8 and the size affected goes up by 1 size category up to huge for each slot level above 2nd.