"An Age of Darkness will come when the lessons of Harmony are forgotten. When Equestria reaches this darkest hour, the Protectors of Equestria will return to lead the way back to Harmony." -- The Final Prophecy of Princess Flurry Heart
The amulet Princess Twilight Sparkle uses to begin day and night starts to fail. She turns to Celestia and Luna, the only ponies who know more about the sun and moon, for help. Is she up to doing what must be done to see another day?
