Ox of the Mithril Order
Ox is a level 53 quest giver located in the Valley of Honor in the orcish city of Orgrimmar. He is affiliated with the Mithril Order.
Ox's job is to send prospective Horde armorsmiths on a journey to find their calling. They first have to complete the quest The Old Ways for Aturk the Anvil. Ox will then give the blacksmith the quest 
[43] Booty Bay or Bust! (Blacksmithing), which will send them on their journey to become an armorsmith.
See List of Orgrimmar NPCs.