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 (heroic)
 * Mercurial Handwraps (heroic)
 * Reinforced Sapphirium Gauntlets (heroic)
 * Reinforced Sapphirium Gloves (heroic)
 * Reinforced Sapphirium Handguards (heroic)
 * Shadowflame Handwraps (heroic)

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

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