So,
The mirror is the mirror of hathor and sekhmet
It pisses some powers
By the explanation of nephthys. She is the real one and got trapped in there. The attacker of nephthys is a she, if you pay attention. The one outside is apparently fake and had caused all the problems. Horus safely came in and made a exit. In chapter 32,horus was possed in lust by the mirror by sekhmet to teach Seth a lesson. Sekhmet mentions nephthys and Horus not being in full conciousness so maybe fake nephthys is like another conciousness. This is yet to be elaborated in season 2 but this is all that is there.
Raws please