When Nighmare moon existed, Equestria went on. But when Celestia is now Solaria who only wishes for eternal day, the foundations of her home begin to crumble at her feet.

The citizens believe it really is the end when even the Elements of Harmony are not powerful enough to defeat Solaria. But will the seemingly merciless Solaria think back to Celestia's past, and become who she was once more?