Dragon's Wrath

You touch your throat and utter a word. Suddenly, a plume of fire spews forth from your mouth in a 50 foot long, 25 foot wide cone, as if you had the power of a Red Dragon's breath weapon. All creatures in range must succeed on a DC 16 Dexterity saving throw, taking a full 17d6 fire damage on a failed save, and half as much 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 2d6 for each slot level above 6th.