Tala's Destructive Dragon

You conjure the head of a dragon that releases a destructive breath of energy in a 80-foot cone originating from you. Choose Acid, Cold, Fire, Lightning, Poison, or Thunder for the damage type. Each creature in a 80-foot cone in front of you must make a Dexterity saving throw taking 10d10 damage of the chosen type on a failed save or half as much damage on a successful one.

Using a Higher-Level Spell Slot. The damage increases by 1d10 for each spell slot level above 7th.