So what you're saying is that Alice has died, been resurrected in a pit of magical, primordial goop that nobody really understands - even the ancient, warrior, death-cult that built their monastic fortress above said pit. She's been brainwashed and used as an assassin by her true, biological father (who, by the way, isn't our main character's biological father - because, oh yeah, our mother has been lying to us all this time about how our little sister isn't actually our sister, but just our half sister)
...
No, that works for me. I'd buy that.