A beam of lightning lances out toward a creature within range, forming a sustained arc of lightning between you and the target. Make a ranged spell attack against that creature. On a hit, the target takes 1d12 lightning damage, and on each of your turns for the duration, you can use your bonus action to deal an additional 1d12 lightning damage to the target automatically. The spell ends if you use your bonus action to do anything else. The spell ends if the target is ever outside the spell’s range or if it enters total cover from you.