Helm of the Forlorn Vanquisher

Helm of the Forlorn Vanquisher was a tier 11 armor token. Prior to patch 6.0.2, it could be exchanged at in Stormwind City or  in Orgrimmar for the following items:
 * Firelord's Hood
 * Magma Plated Faceguard
 * Magma Plated Helmet
 * Stormrider's Cover
 * Stormrider's Headpiece
 * Stormrider's Helm
 * Wind Dancer's Helmet

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