Ball Lightning

A gathering of lightning pools in your hand that you can hurl to a point you choose within range and then erupts in a blossom of arcing bolts in all directions. Each creature in a 10-foot-radius sphere centered on that point must make a Dexterity saving throw. A target takes 8d6 lightning damage on a failed save, or half as much damage on a successful one.

The lightning spreads around corners. It ignites flammable objects in the area that aren't being worn or carried.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the damage increases by 1d6 and the radius expands by 5ft for each slot level above 3rd.