Twilight Sparkle and her friends are summoned by the Friendship Map to solve a friendship problem at Canterlot Castle. But for some strange reason, Nightmare Moon and Daybreaker appear.
Starlight's actions had changed the past. Twilight and her friends were unable to bring Luna back alive, and Daybreaker revaled herself. Now Twilight must do something extreme in order to free Equestria from the solar dictator's cruel reign.
In a fallen world, alicorns do battle as ponies cower in fear and hide from their insane overlords. Gods and monsters roam the world, and two alicorns must face each other to save themselves and their souls.
Celestia sits down for morning tea. That much is regular and calming and a good way to greet the day. She looks across at her darker self, Daybreaker. It would perhaps not be as calming as she had hoped.