Witch Bolt

Duration: 1 minute, Concentration
A beam of blue sustained arc of lightning flashes
out. Make a ranged spell attack. The target takes
1d12 lightning damage. On each of your turns,
you can use your action to deal 1d12 lightning
damage automatically. The spell ends if you use
your action to do anything else, if the target is
outside the spell’s range or if it has total cover.
At Higher Levels. The damage increases by
1d12 for each extra spell slot.