King Sombra of the Crystal Empire and Princess Luna of Equestria are in love and happy. However, Luna's jealousy over her sisters obvious favor with their subjects takes a joyous time, the news of the moon princess pregnancy, and turns it into a time of loss and darkness. Just a few short days after little Astrial Nights' birth, the darkness in Luna's heart consumes her, turning her into the feared Nightmare Moon. Princess Celestia has no choice but to banish her beloved sister, and in doing so provokes the darkness in King Sombras' heart. Astrial Night is then hidden away for her own protection until the day of her mothers return, and her fathers revenge.