Thunderball

A crackling, humming ball of clouds appears in your hand, streaks to a point you choose within range, and then explodes in a burst of lightning that is accompanied by a clap of thunder. Each creature in a 20-foot radius sphere centered on that point must make a Dexterity saving throw. A creature takes 2d6 lightning damage and 2d6 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 3rd level or higher, the damage increases by 1d6 for each slot level above 2nd. You choose if the additional damage is lightning or thunder damage.