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
Additional budget for Character transfer or Character boost to max level. BMAH Services in Shadowlands now requirement to have a max level character on server, so Trial character will not work.
Free time on evening, if you choose selfplay option