The era for peace is over. Despite the best efforts of the Alicorns, an ancient enemy has returned to resume a war forgotten by even Princess Celestia. A world is plunged into darkness. Old foes must become allies if they are to survive.
Months after the sealing of Discord, Celestia is confronted with a new thread to the land she rules and loves. But this threat is coming out of a corner she never had expected. Shall she succeed in her ridiculous quest to let the night last forever?
One day, something terrible and unexpected happens to Celestia, and time is lost to the sands. She'll find that her entire world is gone and that almost everything she knew and loved has disappeared...forever.