In a nation at war, a vengeful shadow seeks to shatter a young alicorn's resolve, forcing her to confront the darkness lying within her. Both are plunged into a relentless dance between horror and heroism as the fate of the world hangs in the balance
Celestia is excited about her wedding to Twilight, but Luna feels left out. All of them have become consumed by the forthcoming event to the exclusion of their responsibilities. Everything is not as innocent as it seems and only Nyx can save the day.
Nyx is learning magic and flying under the best tutors in Equestria, but something keeps going wrong with her magic. It becomes clear that a dark force is at work and all alicorns in the ruling quadrature must pull together to save Nyx and Equestria.
Misty looks up to her hero, hoping one day to be just like her. But when tragedy strikes, how can she come to terms with the fact that even heroes cannot always save everyone?
Nyx and Shining Armor bond over their similar cutie marks and similar special talents. Meanwhile the birth of Shining and Cadence's son binds their family closer together in the midst of Hearth's Warming Eve.