With King Sombra gone, is Equestria truely safe from harm? Or will another foe as old as the Crystal Kingdom itself appear now that the dark unicorn's position of evil is vacant? What new danger will threaten the land and the Elements of Harmony?
For a thousand years, the Code of Harmony has ruled Equestria, and the Code of Dissonance has sabotaged its works at every turn. Now the war for control over the land will come to a head, and one unicorn's decision may decide the fate of all.
A girl dressed like Princess Celestia finds herself in Equestria. Unfortunately, she loses her marbles and decides world domination is better than the Magic of Friendship. Things generally get worse for everypony after that.