Yumi's Esoteric Inferno

Calling upon the 4 true aspects of flame born from the spark of a primordial heart, you conjure a 40-foot-radius magical circle at a point you can see within range. Bursting from this magic circle is a chaotic inferno of primordial flame that covers a 40-foot-radius sphere. Each creature in the sphere makes a dexterity saving throw, taking 3d8 fire, 3d8 necrotic, 3d8 radiant, and 3d8 psychic damage on a failed save or half as much damage on a successful one.