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Felsteel Annihilator drops from Archimonde in Hellfire Citadel on Mythic difficulty. It can also be listed on the Black Market Auction House.
Here you can buy Felsteel Annihilator for EU or US Servers.
You'll get guide for getting Felsteel Annihilator
You'll be able to get Felsteel Annihilator
Felsteel Annihilator mount
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