Husk of the Old God is a Brood of Nozdormu armor token. It can be exchanged along with various idols and scarabs at Vethsera inside the Temple of Ahn'Qiraj for the following items:
This item drops from C'Thun in the Temple of Ahn'Qiraj.
Patch 3.3.0 (2009-12-08): Now tradable using the Bind-on-Pickup trade system.
Patch 1.9.0 (2006-01-03): Added.