I see a lot of people who are mad about no revenge. This was already explained. The MC doesn't care about who stabbed him in the back, he got over it in the pit. He's not interested in revenge, he just wants to go home, that's all he really cares about. Are you people forgetting that he has no proof of the backstab at all, that it would be his word as a renegade against the reputation of one of the Hero's Party? If he wanted revenge, there's no way to seek justice for it, he would literally just have to murder the guy in broad daylight. That's not worth it, it's not worth what that would bring down on his head. He decided a long time ago that it's not worth wasting time on revenge when he could be spending that effort to get back home instead.