After Twilight's use Dark Magic, it begins to infect her. Causing damage to her mentality and is ruining her friendship. She seeks help and tries to stop the darkness from consuming her.
After seeing what happened when she accidently changed her friends destinies, Twilight is curious about about the 'what if'. Like, for example, what if Luna had ponies a thousand years ago who noticed her.
Upon her first use of darkness its taste lingered within her mind, creating an ever growing thirst and revealing her true desires. With her recent elevation to an alicorn and princess she begins to find her desire for power insatiable.
Celestia is dying. Or at least it seems so. Afflicted with a curse that is destroying her very nature, she sets a plan in action. The Bearers of the Elements of Harmony will take the throne in her wake... Not that they know that yet...
Twilight Sparkle, Celestia and Luna are transported into a strange alternate Equestria, the Land of Always Summer, where the day lasts forever and a terrible queen rules with an iron hoof.
Luna's has enough to deal with as Princess Twilight's student. Between nightly nightmares of moon princesses and the threat of an old enemy returning from Equestria's past, Luna isn't going to be getting any sleep any time soon
After being defeated by Nightmare Moon, Twilight is transformed into a puppet of darkness. But when she starts to have flashbacks of a certain baby dragon, she realizes that there may still be hope for Equestria.
With her new apprenticeship under Nightmare Moon, Empress of Equestria and Queen of the Eternal Night, the orphan filly Twilight Sparkle plunges head-first into the conspiracies, secrets and intrigues of the Empire.
After a week of recovering from her return Princess Luna seeks to return what was lost by her banishment and find the one pony she cares for the most... her daughter.
With King Sombra gone, is Equestria truely safe from harm? Or will another foe as old as the Crystal Kingdom itself appear now that the dark unicorn's position of evil is vacant? What new danger will threaten the land and the Elements of Harmony?
For a thousand years, the Code of Harmony has ruled Equestria, and the Code of Dissonance has sabotaged its works at every turn. Now the war for control over the land will come to a head, and one unicorn's decision may decide the fate of all.
Princess Celestia fails to save Equestia at the encounter of Nightmare Moon. Since then Princess Celestia has disappeared. Years later, Twilight Sparkle who is a lead knight has chose to lead her team to save Equestria, Princess Celestia and Luna.