Thundu's Boulders

3-level Conjuration

You designate a point on the ground, as several large stones arc throughout the air, falling onto the area. Each creature in a 15-foot-radius sphere centred on that point must make a Dexterity saving throw, or take 11d4 bludgeoning damage on a failed safe, or half as much damage on a successful one. Structures within the radius of this spell take double the damage.
At higher levels: When you cast this spell using a spell slot of 4th level or Higher, the damage increases by 1d4 for each slot level above 3rd.