Perhaps you will be interested
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
After patch 10.2 might will need character transfer for access to BMAH