Is she actually Mephala incarnate? What is Mephala's relationship to Sithis? Why are the Dark Brotherhood and the Morag Tong rivals? Is Sithis an Aedra gone bad? Why is Mephala considered a "good" daedra? What power does Sithis or the Night Mother truly have other than wispering to mortals?

http://www.uesp.net/wiki/Lore:Night_Mother, http://www.uesp.net/wiki/Lore:Sithis, and http://www.uesp.net/wiki/Lore:Mephala should have the answers to all of your questions.

Those are actually the source of my questions.
So the answer is that no one really knows what Sithis is or his relationship with Mephala.

No, no, no. When someone asks a lore question, we don't link them to wikis, we move the discussion to the lore forum. You'll get answers soon.



There are a good number of scholars who believe this. It makes a bit more sense for the Webspinner to be playing around with the lives of mortals than Sithis, which is change.


Sithis is the Primal Force Padhome. Mephala is a Daedra. Daedra are generally Padhome-aligned et'ada.


http://www.imperial-library.info/content/brothers-darkness


Nope.


She is really only considered "good" by the adherents of the Tribunal Temple, because she is the http://www.imperial-library.info/content/anticipations of Vivec


Again, this depends on your interpretation of the Night Mother's identity. If she's http://www.imperial-library.info/content/mephala, then she's got lots.