A beam of crackling, red energy lances out toward a creature within range, forming a sustained arc of lightning between you and the target, its strength growing as you sustain it. 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 action to deal 1d12 lightning damage plus an extra 1d12 per every full round you have sustained concentration for (so 2d12 on the second round, 3d12 on the third, etc), to a maximum of 4d12 per action. The spell ends if you use your action to do anything else. The spell also ends if the target is ever outside the spell’s range or if it has total cover from you.
At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, the initial damage and the damage maximum increases by 1d12 for each slot level above 1st. (damage continues to increase only by 1d12 per round of sustained casting, so if cast at 2nd level and sustained, initial attack deals 2d12, second action deals 3d12, third action deals 4d12, etc)
(designed to be a superior Witch Bolt)
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