Breastplate of the Wayward Conqueror is a tier 8 armor token. It can be exchanged in Dalaran for the following items:
This item can be found inside the Cache of Winter after defeating Hodir in the 25-man version of Ulduar. It can also be purchased from Arcanist Firael or Magister Sarien for 58 .
[Chestguard of the Wayward Conqueror]