Okay so the Karlach quest comes down to do I believe Karlach that the servants of Tyr are actually a cult working in the service of a devil or do I believe that the (supposed) servants of Tyr are right that Karlach murdered a household without provocation.
I should be able to use detect thoughts, tadpole, sense motive, detect lies or something other than "I guess I gotta believe someone".
Can always speak with dead with one of the corpses in the building with the servants of Tyr
