Rate of Attrition

How pathetic these little sorcerers are, to believe their weak magics torment me. Rather it is the lash of their ignorance that drives me to my knees! The Sigil's location is no great secret, and acquiring the bauble is of no concern of my master. But I will not be ordered about by weakling mortals! They are a pack of whelps that've never set foot on a battlefield. Even their fear is lukewarm! You wish me to give you this prized information? But how could you ever trust information won without a fight, especially from one such as I? No you must earn this great secret, for you to trust my words. As I am unable to claim skulls for my master, you must do it in my stead. Pluck from the Keep of Asavar Kul the head of the most powerful of their warriors and bring his skull to me still with the heat of battle upon it!

Fight your way into the Keep of Asavar Kul within Goring Vale and retrieve the skull of Ralthan Kul. You may have to dig up Ralthan Kul's grave