I didn't get what they did with the soul of Satine at all =.= shitty translations bs but I...

also not sure since there was sometime between me reading the ending so for some reason they swapped to wrong sould ?? seems like maybe sati made a contract to swap her soul or someone else and then the other sould entered satis body and her sould was with the godess the whole story and after wards they checked if the new sould in satis body is happy and let the real satis soul reincarnate but i dont know where ?? ( antoher world ? another couple?? or MAYBE she will be the child of the new queen and emperor ( which would be kinda weird in my oppinion for her to become the daughter of her own body :D) but who knows at least its a happy end