Ball Lightning

You create two globes of lightning in empty squares within range of the spell, then move them up to 20 feet. Globes created by this spell cannot enter the same space as another globe created by the spell and disappear if they are more than 100 feet from you. If the globe enters the space of a creature it stops moving and the creature must attempt a dexterity saving throw. If it is made of conductive metal or wears conductive metal armor it has disadvantage on its save. On a failure it takes 4d8 lightning damage. If a creature ends it turn in the same space as a globe it takes 4d8 lightning damage (no save). On future turns you may control all globes created by the spell as a bonus action, moving each up to 20 feet.