Bring Ilkrud Magthrull's Tome to Delgren the Purifier at Maestra's Post.
Ilkrud Magthrull. Yes, I have knowledge of him. He is a powerful orc warlock that makes his residence at the Fire Scar Shrine, a place of great evil in southwestern Ashenvale.
He had been little more than an annoyance until now, and I had not dealt with him, but it seems that his time has come.