If your entire life was nothing but an endless expanse of ordered grey, what would you do?
For the last 200 years, Equestria has been moulded and formed into the perfect order where there can be no creativity, no imagination, no emotions and nothing outside of perfection, just normalcy. There can be no chaos or disharmony, no madness or malevolence when only order rules but the pristine, perfect world is cracked and rotten at its core.
Twilight Sparkle, a young unicorn studying under the Princess herself will soon discover what Equestria had lost 200 years ago and what lengths she will have to go to bring back that which has been stowed away for centuries.
Because sometimes order is a far more vile thing than chaos could ever be.