Niuzao is the great Black Ox (sometimes called "The Black Yak"), ruler of Niuzao temple and a member of the August Celestials. He can be seen in Townlong Steppes on an island with a number of Pandaren sentinels protecting the temple against the Mantid whom are swarming Townlong because of their spawn coming 100 years earlier then expected.
Mists of Pandaria EditThis section concerns content exclusive to Mists of Pandaria.
Niuzao and other three Celestials opened the gate to the Vale of Eternal Blossoms.
At the conclusion of Shado-pan rep quests, Niuzao is attacked by the Shan'ze clan of Mogu led by Shan Bu during  Surprise Attack!. The Mogu attackers are defeated by the Shado-pan forces led by Ban Bearheart and Niuzao is freed.
War Crimes EditThis section concerns content exclusive to the Warcraft novels or short stories.
Niuzao and other Celestials chose to hold a trial involving the members of the Alliance and Horde rather than sentence Garrosh Hellscream among themselves. During the trial, Niuzao took the form of a strong, muscular tauren male as a show of respect to the gathered races.