Yin Yang (阴阳: Yin and Yang) was an Immortal Emperor from the Sacred Nether World. He was one of the very few who managed to enter the Prime Ominous Grave.
He founded the Yin Yang Gate.
He was among Immortal Emperors who successfully ascended to the Tenth World.
He was killed by Magu during Emperor Demise in the Celestial Academy.