Chest of the Fiery Vanquisher

Chest 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 Tunic
 * Elementium Deathplate Breastplate
 * Elementium Deathplate Chestguard
 * Firehawk Robes
 * Obsidian Arborweave Tunic
 * Obsidian Arborweave Vestment
 * Obsidian Arborweave Raiment

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