Gauntlets of the Forlorn Conqueror

Gauntlets of the Forlorn Conqueror is a tier 11 armor token. It can be exchanged at in Stormwind City or  in Orgrimmar for the following items:
 * Mercurial Gloves
 * Mercurial Handwraps
 * Reinforced Sapphirium Gauntlets
 * Reinforced Sapphirium Gloves
 * Reinforced Sapphirium Handguards
 * Shadowflame Handwraps

Source
This item drops from Magmaw in Blackwing Descent on Heroic mode.

It can also be purchased from the following vendors for :
 * in Stormwind City
 * in Orgrimmar