Belt of the Forgotten Vanquisher

Belt of the Forgotten Vanquisher is a tier 6 armor token. It can be exchanged at Theremis on the Isle of Quel'Danas for the following items:

It can also be exchanged at Kayri for the following Season 3 PvP items:

Source
This item drops from Brutallus and the Eredar Twins in the Sunwell Plateau.