Crown of the Fiery Vanquisher

Crown of the Fiery Vanquisher is a tier 12 armor token. It can be exchanged at in Stormwind City or  in Orgrimmar for the following items:
 * Dark Phoenix Helmet
 * Elementium Deathplate Faceguard
 * Elementium Deathplate Helmet
 * Firehawk Hood
 * Obsidian Arborweave Cover
 * Obsidian Arborweave Headpiece
 * Obsidian Arborweave Helm

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