Helm of the Forlorn Conqueror

Helm 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 Cowl
 * Mercurial Hood
 * Reinforced Sapphirium Faceguard
 * Reinforced Sapphirium Headguard
 * Reinforced Sapphirium Helmet
 * Shadowflame Hood

Source
This item drops from nefarian in Blackwing Descent and Al'Akir in the Throne of the Four Winds on Normal mode.