Dark Blaze

A bright, purple streak flashes from your pointing finger to a point you choose within range and then blossoms with a low roar into an explosion of life-draining flame. Each creature in a 20-foot-radius sphere centered on that point must make a Dexterity saving throw. On a failed save, a target takes 4d6 fire damage and 4d6 necrotic damage, and magical healing restores half health until the start of your next turn. On a successful save, the target takes half as much damage and suffers no additional effects. Undead and constructs take half the normal necrotic damage and do not receive lessened magical healing.

The fire spreads around corners. It ignites flammable objects in the area that aren't being worn or carried with purple flames that emit half as much light as a normal one..

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the fire or necrotic damage (your choice) increases by 1d6 for each slot level above 3rd.