Wraithfire Breath

You cause unnatural purple flames to jet from your mouth, searing a target's very soul.

All creatures in a 20 ft. cone starting from you must make a Constitution saving throw, taking 4d6 fire damage on a failure. If the target is a Humanoid, Aberration, Beast, Plant, or Monstrosity, it takes an additional 3d8 necrotic damage. On a successful save, the target takes half as much damage.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the fire damage increases by 1d6, and the area the cone covers increases by 10 ft. per level of spell slot above 3rd.