Bombarda

A bright streak flashes from your open hand to a point you choose within range and then explodes into a ball of explosive force. Each creature in a 20-foot-radius sphere centered on that point must make a Dexterity saving throw. A target takes 8d6 force damage on a failed save and pushed 20ft in a random direction, or half as much damage on a successful one and not pushed 

double the damage if targeting a structure 

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 level