On a dark night filled with even darker magics, an insane cult attempts to give Nightmare Moon a body and life of her own, utterly separate from Princess Luna. But, when the spell is interrupted by Celestia, something unexpected is created.

Now, a little black alicorn filly named Nyx finds herself living under the care of Twilight Sparkle, only to be haunted by memories and emotions from her past. Is she Nightmare Moon reborn or is she simply a doppelganger with a soul and mind of her own? Can Twilight Sparkle protect Nyx from those who refuse to see past her dragon eyes and black coat?

Or, will Nyx be forced to inherit the sins that may not even be hers and become the greatest evil Equestria has ever known?

Their camping trip to the Everfree had been through some ups and downs, but Twilight and her friends nevertheless return home having enjoyed it. However, as they enter the Friendship Palace, they're shocked to discover an intruder within. A mare with a very familiar face, who has come to them after having escaped a gruesome fate. But, if that were not surprising enough, then they're truly taken aback when this newcomer explains why she's here.