A Truce, As Null And Void As Yourself is the official name of the FC5 Arranged/Forced marriage AU I've been kicking myself to find a name for. Essentially, the plot is, Silva and the Resistance leaders meet with the Seeds to negotiate a truce/peaceful resolution, but Joseph will only give it if Silva is handed over to them and marries a suitor he's chosen... that being Jacob (much to the guy's dismay) because "the Voice said so". This doesn't work for Silva for many reasons (incompatible orientation, she hates Jacob plus the cult's guts and also the fact Joseph didn't even say anything about compensating the Hope County residents for the deaths and destruction they've brought being amongst those reasons), nor does it for Kamski and the Resistance so they decline... until Silva is given time think back on all the things that had lead her to this life, and a visit to Carmina and her parents reminding her of what she lost due to her past hotheadedness and thirst for vengeful justice, and her own guilt over multiple things push her to take the deal with Joseph with a few altercations; she will join Eden's Gate and marry Jacob if he can acknowledge that the marriage is purely tactical and does not at all require her and Jacob to do things that both would find uncomfortable or would be downright impossible for either to commit to, and she wants him to agree to whatever reparations the county wants back for all the trouble and terror Eden's Gate caused them.
By this point, in most fics like this, Eden's Gate and the Resistance would co-exist, and the deputy would slowly live assimilate in the lifestyle of the cult, and find it "not that bad".
Here though? I argue differently. I agree that if an alliance was required, Eden's Gate and the Resistance would team up to deal with the third party. But this isn't an alliance; it's a call for a truce/peaceful resolution to the violence.
I absolutely agree that Joseph views the Seals opening as a bad thing, and would hope to avoid it. He does not want any of his siblings to die, and hopes that his guidance can keep them to the visions where they do survive to see Eden (as his voicemail to John also implies) which the Voice showed him. However, while Joseph believes he can prevent the deaths, he is unaware that the Voice is capable of deceiving him, showing him visions it itself does not intend on following through with.
Joseph doesn't want the Seals to break... but what he doesn't know is that the Voice absolutely does, because that's how the Collapse happens; through sacrifices. It had designed things so that either Joseph loses his family again, or the deputy fails everyone and loses themself + everyone they've come to care for in the process. And in FC5, the Voice got a two-in-one package deal.
In this fic, the truce is exactly as it says on the title... null and void. It's a ploy. The Voice does not care for honor, or human concepts such as trust... it will ensure the Collapse happens, by either pushing its Muse (Silva) to the edge of distress til she fights back and breaks the rest of the Seals and taking all Joseph had, OR the Prophet (Joseph) pushes Silva til she breaks down after losing everything; the life she wanted to live, her independence, her community (again) and herself. The 'As Yourself' part of the title is up to interpretation... either it refers to the Voice, who is hollow inside except for its (preset) sadism and without any humanity whatsoever, or Joseph for literally sacrificing human values just to appease the Voice's demands despite how much damage it does and how much he may not personally like it, making him essentially a puppet, null and void.
As soon as the Voice gives the word, Joseph will break the truce and Eden's Gate will catch the Resistance unaware. At least... that's what the Voice expects to happen anyway.
Silva absolutely does not have a good time. After all, she's stuck in another cult that restricts her freedom and choices, plans on betraying her conditions, seeks to use very manipulation in the book to keep her with them while being unable to make contact with her friends and allies, is surrounded by people who either detest her or she feels absolute guilt for even being in the presence of (due to killing a lot of the followers) and being afraid to fight back in the off-chance that the truce is on.
Nadi and Alexander are the most sympathetic towards her. Faith isn't very sympathetic at first until she spends enough time with Silva that she jealously finds it unfair that Jacob gets to be married to someone who can rail her is such an ideal partner for her (which might lead to do something, le gasp... daring). John gets sympathetic when Nadi leaves him and he stumbles upon Silva in a very vulnerable state of mind. Jacob and Joseph though are the least sympathetic, with the Voice absolutely thriving in her misery.
Does this fic end happily, bittersweet or depressingly? I haven't decided, but it's one hell of a rollercoaster of emotions, that's for sure. This fic (not excluding The True Sinners) is the closest to a "Silva joins Eden's Gate" as you're going to get without completely changing her core values and beliefs.
Hope this is satisfactory!