Originally Posted by
Hitei
Ysera is a spirit/soul/whatever that is heavily nature-attuned so she went to the place nature-attuned spirits go when they die. I don't think there was any particularly important mechanics behind her arriving there. The WQ didn't seem particularly in the know or invested, since Moonberry had to specifically go and ask her to help save Ysera's seed.
I imagine it was just Elune putting Ysera to rest and then things going about their regular intended course.
Re: the actual physical moon, Elune isn't the White Lady, not physically. It is (as far as we know) just an actual regular moon, though I guess there could be other crap going on up there, like it being semi-artificial with Titan constructs or something. The Night Elves worship that specific moon as a stand in for Elune herself, but Elune is a cosmos-spanning entity with followers on multiple worlds.
Presumably any given moon around any planet is representative of her, and she seems capable of both manipulating and acting "through" those moons, being able to trigger eclipses at will.
We do not know what the actual birth of Cenarius entailed. It's possible that Cenarius was simply formed out of the combination of her and Malorne's essences.
Elune is a very complicated entity. As it stands she seems to be singularly powerful, as in well beyond the scope of even things like the Titans or Eternal Ones, SL stuff frames her as potentially being a member of the Pantheon of Life, whatever form that takes, but she is a being who primarily seems to act through nature-arcane magic and also dabbles in both shadow and light.