Sunset Shimmer, in Equestria, Has to deal with being a part of Twilight Sparkle's team, per her request, despite her own feelings of inadequacy, regrets, fears, and worse of all, her newfound love for Twilight Sparkle. Can she ever earn it?
When the Elements of Harmony saved Princess Luna, they left the job half finished. There's a voice inside her head, and it's trying to drag her back down into darkness. She's going to have to deal with it somehow. But that's exactly what it wants.
(Spoils for s7 25/26) The Pony of Shadows is back and one of the first things he does is use his dark magic to take over one of the ponies who freed him from his 1000 year long imprisonment.
Ten years after Nightmare Moon returns from her exile and plunges Equestria into Eternal Night, Celestia escapes from her solar prison. Weakened and alone, she needs to rebuild her strength. But how can she put things right?
A half-remembered dream leads Twilight Sparkle to test a new "window" spell by looking at an alternate Equestria. What she sees there will lead her and her friend Princess Luna into adventures they had never imagined possible. A season one fic.
Nightmare Moon had finally broken free of her prison. It was time to get her revenge on Celestia and bring about night eternal. Six mortal ponies rose up to stop her, using the power of the Elements of Harmony.
Twilight Sparkle failed her entrance exams for Celestia’s school. Worse, she is a danger to both herself and others, resulting in her magic being suppressed. Dreams crushed and now one of the weakest unicorns, a nightmare comes to her.
A young man that's never heard of the MLP franchise is sent to Equestria, but not by Discord or one of Twilight's failed spells. This time, the victim is forced in by Nightmare Moon. He'll have to rediscover what it means to be alive.
A dark curse lies upon Twilight. An old foe has chosen the Summer Sun Celebration to return. Using Twilight's body as her host. Can her friends save her, before it is too late?
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.
Why didn’t Princess Luna come to help fight off the Changeling invasion during Shining Armor’s wedding to Princess Cadence? Now we know - she was having a few problems of her own in an alternate universe where Nightmare Moon ruled unchallenged!