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So you can place him under oath or let him roam free, treat him with cruelty or kindness, turn him good or keep him evil... but it has no effect on the epilouge. At all.
I mean you could say the same about Viconia really. Neutral, Evil, doesn't effect the epilogue either way.
Thats just not on. Something as major as changing someones world view should totally effect their actions.
Now I know any existing writing in-game can't be changed BUT, you are allowed to add writing in if it doesn't alter anything already present. Right? Well, make Sarevoks "tortured soul" bollocks the evil epilogue and add in a new "good" epilogue. Possibly one where his woman isn't dead because quite frankly I didn't kill her and I'm not sure any good character would. Same with Viconia only her ending was kind of nice if I remember right so maybe add in an evil alternative.
Otherwise whats the point?