Arcane Barrage

You hurl three orbs of energy at a point or points within range, and then blossoms with a low roar into an explosion. Choose Acid, Cold, Fire, Lightning, Poison, or Thunder for the type of orbs you create. Each creature in a 10-foot-radius Sphere centered on that point/points makes a Dexterity saving throw for each orb, taking 3d6 damage of the selected damage type, per orb, on a failed save or half as much damage on a successful one.

Using a Higher-Level Spell Slot. You create one additional orb for each spell slot level above 4.