Leggings of the Fiery Vanquisher

Leggings 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:
 * Elementium Deathplate Greaves
 * Elementium Deathplate Legguards
 * Obsidian Arborweave Leggings
 * Obsidian Arborweave Legguards
 * Obsidian Arborweave Legwraps
 * Firehawk Leggings
 * Dark Phoenix Legguards

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