After a terrible accident, Twilight's life hangs in the balance, but for Celestia, this is the perfect opportunity to carry out her plans to vanquish a growing evil . . .

Equestria is caught in a three way Civil War between the three pony races, and the great nation's last hope resides with the last known Alicorn, Twilight Sparkle. Only she can enact Clause 2891, or Swan Song, and save Equestria.