Uldorak

Uldorak was a Earth-Dragon who terrorized the kingdom of Candoness for many generations. Whenever a new monarch was named, Uldorak appeared, demanding tribute in the form of gold and magical trinkets. Tired of such demands, Dowager Queen Tansis XII called on Sir Davion, the to ambush Uldorak on the day of her son's coronation. Accustomed to submission from the people of Candoness, Uldorak did not expect resistance, and was slain by Davion.

The newly crowned king, Tansis XIII, was extremely grateful for Davion's deed, and rewarded him with a new set of armor, mounted with the slain dragon's horns. Judging by the likeness of his helm, Uldorak was red, and had two horns.

Dragons Blood
In DOTA Dragon's blood. At the episode What the Thunder Said. Uldorak's nest was stumbled on by Davion and they managed to let him sleep. The Next day he is slain not by Davion, but by Fruhling. who is possessed by Terrorblade. Terrorblade then steals his soul and later used his body to defeat and kill Slyrak.