Violet Inferno

Vibrant violet flames roars up from the ground. Each creature in a 15-foot-radius centered on a point within range makes a Constitution saving throw, taking 3d6 Fire damage and 3d6 Psychic damage on a failed save or half as much damage on a successful one. The creatures damaged by this spell subtract 1d4 from the next saving throw they makes before the end of your next turn.

Using a Higher-Level Spell Slot. The Fire damage and the Psychic damage increase by 1d6 for each spell slot level above 3.