The quest giver wants me to get five Threads of Thought. So far I've been killing Restless Souls and Corrupted Souls with my mage. After killing tons of those, I gathered three Threads of Fate. However, to get Threads of Thought, I'd have to release Forsaken Souls, right? I have no necromancer character! Does this mean, the quest can only be done by necromancers, cause they can cast Exorcism?