Like all empires Celestia's empire has now crumbled. Under the weight of several rebellions the unified land of Equestria falls into three. The way of benevolence and peace, the kingdom of Oti, led by Fluttershy, once timid pegasus who now fights for true benevolence.

The conquerors kingdom, Night, led by Twilight Sparkle, who seeks to repair the kingdom of Celestia, now rid of the cancers that toppled it.

And finally the kingdom of Pie, led by the Pie family, rock farmers and philosophers who seek to use their knowledge of war to unite the kingdom once again.

War engulfs the once peaceful kingdom, bringing chaos where there was once peace.
The empire long divided must unite, and the empire long united must divide.

(Based on the Chinese historical novel Romance of the Three Kingdoms. Elements, story or otherwise will be changed.)