The Battle of the Two Sisters is over, and with it, Luna's Rebellion, its leader banished to the Moon by the Elements of Harmony. Her opponent's army shattered, its leaders all but gone and its greatest warriors either dead or in flight, Princess Celestia's position looks secure.

To the north, however, a threat remains. King Sombra of the Crystal Empire, beloved by his subjects, had declared for and fought alongside Luna during her rebellion. Now, he moves desperately to secure his city and its inhabitants, with the wrath of Celestia's army hot on his heels.

The fate of an entire nation hangs in the balance. Though Celestia was known in peace for her adherence to kindness and harmony, there is no telling the rage and hatred that Luna's Rebellion had unleashed. The Battle of the Two Sisters is over, but the Battle of the Crystal Empire is just beginning.

Only one thing is certain: Celestia's wrath will crash upon the Crystal Empire like a great wave and brutality will become the defining feature of the solidifcation of her reign - for there is no mercy under the Black Sun.