Banishing Volt

You conjure a sphere of dark purple energy above the ground, several lightning bolts strike at random directions. Each target in a 20-foot radius centered on that point must make a Dexterity saving throw. A target takes 8d6 lightning damage on a failed save or half as much if they succeed. 

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the damage increases by 1d6 for each slot level above 3rd.