Cold Dragon Breath

Each creature in a 15ft cone must make a CON saving throw. The DC for this saving throw equals 8 + your Constitution modifier + your proficiency bonus.
A creature takes 2d6 damage on a failed save, and half as much damage on a successful one. (The damage increases to 3d6 at 6th level, 4d6 at 11th level, and 5d6 at 16th level.)