Axor's Storm Snake

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.

At Higher Levels. When you cast this spell at 6th level or higher, increase the lightning damage by 1d6 for each additional slot.