Stuck in an empire ruled by a nightmare 5 ponies try to stop the moon. Without Twilights magic Celestia is killed. Pony ville becomes the city of night. Cloudsdale is overcome with thunder pegasi. All unicorns are imprisoned. Supporters of Nightmare are given authority. Apple acres becomes a rock farm. Color is forgotten. A blue streak flies through the sky. A mysterious pony that laughs at all things pony like he isn't one himself arrives. He claims he is a time traveler and that reality is about to fall apart. He says it all roots from a warrior who shouldn't have died. A warrior incrusted with 3 diamonds.