Fire Breath

When you take the Attack action on your turn,
you can replace one of your attacks with a breath
attack in a 15-foot cone. Each creature in that
area must make a Dex save. On a failed save, the
creature takes 1d10 Fire damage. On a successful
save, it takes half as much damage. This damage
increases by 1d10 when you reach 5th level
(2d10), 11th level (3d10), and 17th level (4d10).