Voltaic Orbs

You generate two large spheres of electric energy and hurl them at separate points within range. The spheres detonate in a 10 foot cube of arcing electric force. All creatures within either cube must make a Dexterity saving throw, taking 3d8 lightning damage on a failure, or half as much on a success. Creatures caught in both spheres only take damage from a single orb, but make the saving throw at disadvantage.

At higher levels. When you cast this spell using a 3rd level slot, the damage increases by 1d8 for every slot level above 2nd.