Now you receive your assignments directly from Arch-Mage Traven. He will ask you to visit Nenyond Twyll, south of the Imperial City, to help protect a Mages Guild informant who is spying on a group of necromancers. When you arrive at the ruin, you’ll discover that there is only a single Imperial Battlemage still alive and he die shortly after you arrive. Explore the rest of the ruin until you meet the necromancer Mariette Rielle who tells you that the spy has been turned into a Worm Thrall. Kill her and activate the nearby switch to open the room where the former spy is wandering around. Simply attempt to talk to him and then return to Arch-Mage Traven with the news. Killing the Worm Thrall is not necessary. After the quest is complete, talk to Raminus to receive your promotion to Warlock.