Some minor spelling errors, but overall great!

Oh, this is the "what came first" question again. If asked, I'd say that Dark did not exist before Light did. Cause the former is defined as absence of the latter, and if there is no latter, you cannot define the former. Another point is if we "broaden" the Light definition a bit, saying that all photons belong to it, not only small specter visible by humans - then there is pretty much no place where there's no "light" - there's heat radiation, there's radiation from atomic reactions, there's much more different things. So Dark is more like Emptiness, and then - it is easy to understand that even while Emptiness existed before Matter, people love Matter more. After all, they're made of matter))

Also, demons being creatures of order? That's pretty specific demons you're telling about here, I believe like Baatezu from DnD, but even they are not exactly that. I guess you make it this way for them to oppose Eris. Still, very strange.