Gauntlets of the Forlorn Vanquisher

Gauntlets of the Forlorn Vanquisher is a tier 11 armor token. It can be exchanged at in Stormwind City or  in Orgrimmar for the following items:
 * Firelord's Gloves (heroic)
 * Magma Plated Gauntlets (heroic)
 * Magma Plated Handguards (heroic)
 * Stormrider's Gloves (heroic)
 * Stormrider's Grips (heroic)
 * Stormrider's Handwraps (heroic)
 * Wind Dancer's Gloves (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