Meet up with Ban Bearheart outside Niuzao Temple in Townlong Steppes, and put a stop to the Mogu Invasion there. Join the Battle at Niuzao Temple and defeat the Mogu Invasion. Part of this quest happens in Townlong Steppes.
Upon completion of this quest you will gain 5 150 experience, 1,000 reputation with Shado-Pan and Reins of the Onyx Cloud Serpent.
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You'll get guide for completing The Shadow-Master - Surprise Attack! - Reins of the Onyx Cloud Serpent