Mythdragon is one of the five paragons of the 33 Heavens. He was the paragon that led the 33 Heavens in the third attack against the Mountain and Sea Realm.
Due to being inept at strategy, unlike Xuan Fang, he ended up giving the Mountain and Sea Realm time to seize back the initiative in the war. This also allowed Meng Hao time to recover from his fatal injuries. After Meng Hao awoke, he used his life-blood, seriously injuring himself in the process, to free Xuan Fang from Meng Hao's Essence of Space.