Chroma Sphere

You gather the fundamental destructive forces of creation into a single point before unleashing them simultaneously. A sphere of impossible multicolored energy erupts at a point you can see within range, unleashing a cataclysm that simultaneously manifests acid, cold, fire, lightning, poison, thunder, and force.

Each creature in a 40-foot-radius Sphere centered on that point must make a Dexterity saving throw.

On a failed save, the creature takes: 4d12 Acid + 4d12 Cold + 4d12 Fire + 4d12 Lightning + 4d12 Poison + 4d12 Thunder + 4d12 Force damage.

On a successful save they take half as much damage. 

You can choose to instead focus on a single damage type instead of multiple. If you do the spell deals 12d12 of that type.