Shoulders of the Forlorn Conqueror

Shoulders 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 Mantle (heroic)
 * Mercurial Shoulderwraps (heroic)
 * Reinforced Sapphirium Mantle (heroic)
 * Reinforced Sapphirium Pauldrons (heroic)
 * Reinforced Sapphirium Shoulderguards (heroic)
 * Shadowflame Mantle (heroic)

Source
This item drops from Cho'gall in the Bastion of Twilight on Heroic mode.

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