They say memories and experiences build a being's character, rather than a set fate. What would happen to the little filly know as Twilight if she were to be ripped out of society and thrust into Draconia, with nothing save her magic and an egg?
The history of Equestria before unification of the tribes has been one lost to the fate of time. When an evil from that time returns, along with an unexpected ally, what will Celestia and Luna have to do to save the lives of every thing in existence?
Luna's has enough to deal with as Princess Twilight's student. Between nightly nightmares of moon princesses and the threat of an old enemy returning from Equestria's past, Luna isn't going to be getting any sleep any time soon