Divine Fireball

A bright streak flashes from you to a point you choose within range and then blossoms with a low roar into a Holy explosion. Each creature in a 20-foot-radius Sphere centered on that point makes a Dexterity saving throw, taking 8d6 Radiant damage on a failed save or half as much damage on a successful one.

The damage increases by 3d6 if the target is a Fiend or an Undead.

Using a Higher-Level Spell Slot. The initial and extra damage increases by 1d6 for each spell slot level above 3.