True Dragon's Breath

You grant yourself the power to spew magical energy from your mouth. Choose acid, cold, fire, lightning, or poison. Additionally, choose a 30-foot cone or a 5-foot by 60-foot line. Until the spell ends, you can use an action to exhale energy of the chosen type in the chosen pattern. Each creature in that area must make a Dexterity saving throw, taking 8d8 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 7th level or higher, the damage increases by 1d8 for each slot level above 6th.