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The Shackled Ur'zul is a very rare drop from Argus the Unmaker, the final boss of Antorus, the Burning Throne, on Mythic difficulty. This mount can be purchased through the Black Market Auction House.
Here you can buy Shackled Ur'zul for EU or US Servers.
You'll get guide for getting Shackled Ur'zul
• You'll be able to get Shackled Ur'zul
• After patch 10.2 might will need character transfer for access to BMAH