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The Core Hound Chain teaches you the Core Hound mount, and was originally a special anniversary event award. It can rarely be listed on the Black Market Auction House.
Here you can buy Core Hound Chain for EU or US Servers.
You'll get guide for getting Core Hound Chain
• You“ll be able to get Core Hound Chain
• After patch 10.2 might will need character transfer for access to BMAH