void ball

A bright streak flashes from you to a point you choose within range and then blossoms with a Abyss scream into a explosion of null energy. Each creature in a 20-foot-radius Sphere centered on that point makes a int saving throw, taking 6d8 force/fire split damage on a failed save or half as much damage on a successful one. And you can't roll a 1on damage only 2-8

Using a Higher-Level Spell Slot. The damage increases by 1d8 for each spell slot above three