Make a ranged spell attack against a target within range. On hit, the target takes 1d4 lighting damage. Lightning springs from the target, and all creatures within a 5 feet radius of the target make a dexterity saving throw. On a failed save, they take 1d4 lightning damage.

Both damage rolls increase by 1d4 at 5th level (2d4), 11th level (3d4), and 17th level (4d4).