Crackling Ray

You conjure a ray of purplish energy toward a creature within range of the spell, forming an arc of crackling energy between you and the target. Make a ranged spell attack against the target. On a hit, the target takes 1d12 lightning damage; in addition, once you’ve hit your target, on each of your turns until the spell ends, you can spend an action to deal 1d12 lightning damage to the target, without needing an attack roll. The spell ends prematurely if you use your action to do anything else, if the target is out of range, or if it has total cover.

At Higher Levels. When you cast this spell by spending Mana points equal to a 2nd-level spell or higher, the damage increases by 1d12 for each level above 1st. When cast as a 5th-level spell or higher, the lightning damage becomes plasma.