You have to have Rebel approval at at least 50 (halfway point of the bar), and possibly you need friendship with Gisette as well? Then you'll have to carefully navigate your way through two conversations to convince both parties to sort things out peacefully. Oh, and you need to have seen all the Rebel secrets.
Definitely not that, I can "greatly influence" 2 options, but the one that encourages peace in general just increases conflict, for example, I have three options in that last choice for Revaire, Increase Peace (which only increases conflict ), Increase Allies who are for Peace, and Argue for better negotiations for Revaire.
By the way, I sorry for the nitpicks, this is a marvelous game that I love and have been looking forward for years. It is every bit as good as I ever imagined! Thank you for it!
Also just got the Revaire peaceful resolution with romancing Gisette (was romancing Clarmont unlike he dumped me :/ ). I had high Gisette respect and low rivalry/romance/friendship. I'd uncovered all the rebel secrets and I think you also might need high enough respect/friendship from Sayra (which is made easier if you ace the trial).
Yeah, this is something I'm not sure about either. I've never gotten the bar to more than 50% before the conversation with Sayra about Revaire's future, and even that I've only managed on my playthroughs where Katiya's legacy is my announced goal, so it seems like I definitely need that bump. I don't know anything for sure, but maybe befriending Clarmont and having high approval with the servants helps? I know you don't have to invite Sayra to an event to get the peace outcome, because I haven't done that before. It might help, though?
Yeah, being nice to servants definitely helps. If you get the gifts from Mrs. White and Sayra and Ria, then that's a sign that you're on the right path. I didn't invite Sayra out either, so that's not required (though inviting her to the Onvu tournament certainly wouldn't hurt). I raised the rebels approval by like 1/4 of the bar in week six and part of that was pulling off a successful ball. The other big boost was my convo with Sayra, which happened automatically. Couldn't say why she opened up to me and not you :(
I think it's just saving Penelope and the Summit (following Katya's , yeah. I bet that the servant scene before Clarmont's week 1 date also influences it. I was romancing Clarmont on this play through, so maybe that gave me more opportunities too? Antagonizing Gisette during the opening scenes helps too, but I think that may be more counterproductive if you want her to agree to peace...