Aoth's Thunderball

A bright streak flashes from your pointing finger to a point you choose within range and then explodes in a cacophonous sound that can be heard for 1 mile around. Each creature in a 20-foot-radius sphere centered on that point must make a Constitution saving throw. A target takes 6d8 thunder damage on a failed save, or half as much damage on a successful one.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the damage increases by 1d8 for every 2 spell slot levels above 3rd.