Crackling Ball

A small orb appears wherever you command it to within 60 feet of you. Any creatures within 15 feet of this orb must make a dexterity saving throw, or have an arc of lightning branch out from the ball and strike them. On a failed save, the hit creature(s) take 6d8 lightning damage. On a successful save, the creature(s) take half damage.

At Higher Levels. When casting this spell using any spell slot above 4th, add another 1d8 lightning damage, and increase the diameter of the circle by 15 feet. When casting this spell at 9th level, you gain Lightning immunity for the duration of the spell, and creatures who fail the saving throw within 15 feet of the origin take full damage. On a successful save, they take normal damage.