Weeks after the return of Nightmare moon, Luna is haunted with the memories and the horror, that had once consumed her heart. Will Luna be able to defeat the darkness that still haunts her at night. Will the Elements of Harmony be able to defeat the darkness that is consuming the castle.

Princess Celestia is leaving Canterlot to fight a darkness that is sweeping through all of Equestria. Leaving Princess Luna as the new ruler, she must begin teaching Twilight the many ways of being a princess. Will Luna be able to handle the task, or will Celestia's death have more than just an effect on Twilight's teachings?