And I got a Crazy idea about all of This, in Norse Mythology they had someone known as Surtr(Surtur/Surt) the Fire Giant, Leader of the Fire Giants, Fire Demons, Ruler of the Realm of Muspelheim - The Land of Fire, who was said to bring forth the Ragnarok(the end of the world), and at some point in Norse Mythology it was said that Odin(King of the Norse Gods) had sealed Surtr in the Earth's Core(which may explain where Christianity got the idea that the Devil lives in the center of the Earth, or maybe the other way around), anyways My idea would be: What if the Ragnarok was unleashed on the Pony's Earth, but was stopped by some heroes or whatever, and the Pony Earth & it's Moon were encased in some kind Cursed Barrier that would Not allow the light of the Sun to shine upon it, so to compromise, Odin had sealed Surtr inside a Sphere that was illuminated by his own Fire-Magic, and used That Sphere as a Make-Shift Sun until a permanent solution to the Pony-Earth's Sun-Problem could be found, and the Unicorns were able to use their Magic to move the Surtr-Sphere around to control Night & Day, until the Alicorns(mostly Celestia) took over controlling the Surtr-Sphere, and should That Sphere ever be broken, then Surtr would be free to bring forth the Ragnarok all over again, but it's just a Crazy Idea.

