Surging Crown

A Crown of lightning wreaths around the targets head. The target must make a Constitution saving throw. It takes 8d6 lightning damage on a failed save, or half as much damage on a successful one. The crowned target sheds bright light in a 30-foot radius and dim light for an additional 30 feet. At the end of each of its turns, the target repeats the saving throw. It takes 4d6 lightning damage on a failed save, and the spell ends on a successful one.