Age of Cinder
A seven feet tall humanoid looking creature with bright blue scales. He had draconic features and sharp claws. He called himself “Cyanwrath”, a name probably made up.
During the Assault on Phandalin by the Cult of the Dragon he challenged the defenders of Whitehill Keep to single combat, the Party refused and Helynna Valen accepted the challenge. Helynna Valen easily defeated/decapitated the Dragonborn. When the Party entered the Cult’s camp they discovered Cyanwrath had been resurrected, then tried to smoke “magic-leaf” with him. When Syphillus returned and collapsed the cave out of rage, Cyanwrath survived due to not needing food or water, and was able to escape his way out after several days of digging.