Ball Lightning

You create four 3-foot-diameter spheres of lightning. 

Each sphere appears in an unoccupied space you can see within 120 feet of you. The spheres last as long as you concentrate, up to 1 minute. Each sphere sheds dim light in a 30-foot radius. Spheres levitate and can move over obstacles.

When any creature other than you ends it turn or moves within 5 feet of a sphere, the sphere discharges lightning at that creature. That creature must make a Dexterity saving throw. The creature takes 4d8 lightning damage on a failed save, or half as much on a successful one. As a bonus action, you can move each sphere up to 30 feet, but no farther than 120 feet away from you. If you ram the sphere into a creature, that creature must make the saving throw against the sphere's damage, and the sphere stops moving this turn