Updated with new information Edit
Kill Mogrul without Slitter viewing the kill. Use dead thrall to raise him. Slitter will follow undead Mogrul.
Yeah, except Slitter is weak for some reason, he took exactly one hit from a Reaver Marauder (on Expert) and dropped to his knees. It's strange though how the game considers him a companion even though he isn't. Holythirteen (talk) 02:37, February 11, 2014 (UTC)