Leggings of the Forlorn Protector

Leggings of the Forlorn Protector is a tier 11 armor token. It can be exchanged at in Stormwind City or  in Orgrimmar for the following items:
 * Earthen Legguards (heroic)
 * Earthen Legplates (heroic)
 * Kilt of the Raging Elements (heroic)
 * Legguards of the Raging Elements (heroic)
 * Legwraps of the Raging Elements (heroic)
 * Lightning-Charged Legguards (heroic)

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

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