A serpent of crackling lightning bursts from your hand, leaping around the battlefield to electrocute multiple enemies. Select a number of five-foot cubes within sight equal to your wizard level. One cube must be adjacent to yourself and every cube must have a face in contact with at least one other cube. Every creature in one of these squares takes 8d6 lightning damage on a failed Dexterity saving throw, or half as much on a successful save. Additionally, if there is a creature within the final cube you created, the serpent bites at it. On a successful ranged spell attack roll, the creature takes 2d10 piercing damage as well as the lightning damage.