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The Reins of the Astral Cloud Serpent is a rare drop from the Cache of Pure Energy after defeating Elegon in normal and heroic Mogu'shan Vaults. It also has a chance to be listed on the Black Market Auction House.
Here you can buy Astral Cloud Serpent for EU or US Servers.
You'll get guide for getting Astral Cloud Serpent
• You'll be able to get Astral Cloud Serpent mount
• Astral Cloud Serpent mount
• After patch 10.2 might will need character transfer for access to BMAH