Ancient Dragon's Breath

You imbue greater draconic energy into a willing creature, this creature can now spew magical destructive energy from its mouth. Choose acid, cold, fire, lightning, or poison. For the spell’s duration, the creature can use an action to exhale energy in a 60-foot cone. Each creature in that area must make a Dexterity saving throw, taking 6d10 damage of the chosen type, or half as much on a successful one.

At Higher Levels. When you cast this spell using a spell slot of 6th or higher, the damage increases by 1d10 for each slot level above 5th.