It's sold by vendor for 1xCowl of Gul'dan.

If anyone has or has a screen shot of this helm, please submit it, by the name of it, it must be pretty cool lookin

You fool he only became thelich king after kil'jaeden killed him and emplaced his soul in ice he used to be a orc and ofc this is for a restoraion shaman because ner'zhul was a powerful orc shaman and it looks nothing like the helm of the lich king

This belonged to the CHEIFTAIN Ner'Zhul which means it's from before he became the Lich King other wise it would be called Shroud of the Lich King Ner'Zhul.