Ok, I got the quest to purge the tower from Solberg, and I went underground and killed some demon (I forget his name, It was something the Ice Lord) He was sorrounded by pylons and he had a spellbook with Terror behind him. I went back up to get my reward and nothing happened. When I talk to Solberg, It is as if I never completed the quest. I am wondering If I killed the wrong demon or if this is a glitch?