Responses
Pretty sure the mirror is meant to manipulate. It replaces your love for someone with another and locks that memory of your prior love in the mirror. Osiris mean for Seth to see the mirror but instead neph did. Hathor wanted to make Horus fall in love with her but for some reasons Horus was able to remain his true self.
I think Osiris put a part of himself in the mirror because whoever looks in the mirror is supposed to show who they truly loved so when he gifts it to Seth he would look in the mirror and would automatically show Osiris as his true love except Nepthys looked into the mirror so it registered her as that person. Anyways ik they probably wanna stay away from Duat but I hope they jump him or smth.