i killed lord j'narus and it didnt give me anything so it must be you have to wait till you get to cauldron hallow to get him cause its not the one behind the citedel
I assume that the quest I have listed as "Skull of hate" is the one for this item. The quest starts with a chest drop item "a shattered skull"( I cannot remember if it was no-drop when I looted it). There are three parts to the quest. First part is to carry the skull to the Funeral Pyre in Nek, you dont have to actually fight your way up to the pyre just get close enough to get discovery XP and quest will update. Second is kill skellys untill you find a set of teeth to fit into the skull. The last part is to kill Warlord J'Narus for his eyes. You have to examin the skull after compleating each part, so keep it handy. I've done all but the last part of the quest, I've killed J'Narus once but did not get a quest update. I'm not sure if this is a but that may have been fixed in the past week or so or if you need to kill him more than once. Either way he is due for a meeting with me as soon as I get a group in his area.