Finish wrote:4. Mel will kill Quain in the same moment Quain kills her
Actually, this comes close to a bit of wild speculation of future plot that I have, only it is different:
Syphile goes to kill Quain, but has some difficulty, though her new training allows her to keep the fight going. Mel arrives and in her own desire for revenge she ends up helping Syphile kill Quain. Quain dies seeing the two who grew to hate her working together. Afterward, Syph starts to say something to Mel but Mel leaves stating it only was to meet her own ends, and she doesn't care what Syphile does. Syphile goes back to the Sharen, successful in her goal (bringing back a grisly tid-bit of Quain as proof), but keeps Mel's involvement to herself, allowing Mel to disappear as she pleases.
Following that note though, I suspect that Vy'chriel will fail in killing Sil'lice, and pay with her life while Sil'lice escapes. Syphile will arrive to find Vy dying/dead. She has the golem Yaeminira carry Vy's body back to the Sharen fortress. Zala gives her a proper send-away (mostly for appearances), and Syphile is given her position and keeps Yaeminira as her protector. Syphile may or may not take Vy's name, or she will adjust her own name. She'll lament Vy's passing, as during her training Vy was kind to her and was probably one of the few friends she had.
... yeah, that last part is a bit stretching but eh, Runes might like that one other than a dying Vy'chriel.