Nishiki (Three Houses AU)

Takes place during a timeline where Koi died during the Emperor's initial takeover of Garreg Mach. Not because she was aligned to anyone, because she made a desperate plea with both sides to not make her choose a side and they should talk it out. The Emerald Serpents are left in shambles without their leader and the timeline is unstable. Sothis decides to align with Nishiki because Nishiki has almost all of Koi's memories from her excursion in order to re stabilize the timeline and prevent Kronya from trying to pull an Alfric