Better Witch Bolt

A beam of crackling, blue energy 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. Until the spell ends, you can make the attack again on each of your turns as an action. If you do any other than action the spell ends. If you target the creature you hit on your last turn, the attack automatically hits.
At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, the initial damage increases by 1d12 for every slot level above 1st.