Breath of Bahamut

Channeling the righteous fury of Bahamut, you unleash a radiant breath weapon in a 15-foot cone. Each creature in that area must make a Dexterity saving throw. On a failed save, a target takes 2d8 radiant damage, and on a successful save, it takes half as much.

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, the damage increases by 1d8 for each slot level above 1st.