Demon's Breath

Your infernal heritage imbues you with the power to spew magical fire from your mouth. Until the spell ends, you can use an action to exhale fire of the chosen type in a 20-foot cone. Each creature in that area must make a Dexterity saving throw, taking 3d8 damage of the chosen type on a failed save, or half as much damage on a successful one.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the damage increases by 1d8 for each slot level above 3rd.