Crown of the Wayward Protector

Crown of the Wayward Protector is a tier 8 armor token. It can be exchanged in Dalaran for the following items:
 * Conqueror's Siegebreaker Greathelm
 * Conqueror's Siegebreaker Helmet
 * Conqueror's Scourgestalker Headpiece
 * Conqueror's Worldbreaker Faceguard
 * Conqueror's Worldbreaker Headpiece
 * Conqueror's Worldbreaker Helm

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