Helm of the Fiery Conqueror

Helm of the Fiery Conqueror was a tier 12 armor token. Prior to patch 6.0.2, it could be exchanged at in Stormwind City or  in Orgrimmar for the following items:
 * Immolation Faceguard
 * Immolation Headguard
 * Immolation Helmet
 * Cowl of the Cleansing Flame
 * Hood of the Cleansing Flame
 * Balespider's Hood

Source
This item drops from Ragnaros in the Firelands on normal mode.