Crackling Verdict

You point at a creature. A small lightning bolt shoots forward from your fingertip. Make a ranged spell attack against the creature. On a hit, the target takes 3d8 lightning damage. If the target is a size Medium or smaller it also takes 1d8 thunder damage. If the creature is size Large or bigger, it has to succeed on a Constitution saving throw (DC 15). On a failed saving throw, the target takes 1d8 thunder damage and half that much on a succes.