Quote Originally Posted by Eldan View Post
That might just be a bit too reckless for lawful good party members

I really think your best bet is using hard mind control. Use him as a puppet until the end of the war, then replace him when you can handle some internal unrest.
Which is why you don't tell them. It makes it all the more believable when your party paladin Angily swearing vengeance on the one responsible for the citizens suffering and get's him shiny points.