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
 * Magma Plated Gauntlets
 * Magma Plated Handguards
 * Stormrider's Gloves
 * Stormrider's Grips
 * Stormrider's Handwraps
 * Wind Dancer's Gloves

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