After a thousand long years, Princess Luna was finally freed from Nightmare Moon and welcomed back to Equestria. But she became Nightmare Moon for a reason, didn't she? What if Luna wanted to take over Equestria even before she succumbed to jealousy?
Having returned from the moon, she secretly writes her efforts to seize the throne and notes the challenges that stand in her way. But if there's one thing that hasn't changed over the last millennium, it's the fact that she can't recognize a losing battle when she sees one.
(Thanks to SpaceCommie for editing!)