Crown of the Wayward Conqueror

Crown of the Wayward Conqueror is a tier 8 armor token. It can be exchanged in Dalaran for the following items:
 * Conqueror's Aegis Faceguard
 * Conqueror's Aegis Headpiece
 * Conqueror's Aegis Helm
 * Conqueror's Circlet of Sanctification
 * Conqueror's Cowl of Sanctification
 * Conqueror's Deathbringer Hood

Source
This item can be found inside the Cache of Storms after defeating Thorim in the 25-man version of Ulduar.

This item is also sold by the following vendors for :
 * in Dalaran
 * in Dalaran