One day, Fluttershy wakes up only to find herself in a changed world. Ponyville and Equestria are not how she remembers them: airships cross the sky, steam-powered machinery drives the economy and the rule of Celestia is no more. In this strange alternate world, Fluttershy reunites with her dear friends and learns of the event that changed history itself. Worse, the timid pegasus seems to have arrived just in time to witness the rapidly approaching climax of a civil war that has been raging for three hundred years...

Celestia, Luna and Discord were but three of the thirteen. Once there were others like them, other Scions who were charged with overseeing the world in the name of Harmony. This is their sad and sorrowful tale. One that has been passed down by ponies through generations, until it was considered naught but an old mare's tale... This is Equestria's own mythology.