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?

Equestria is a land of rainbows and pastel-coloured ponies, where friendship is a tangible force and villians are redeemed as often as they are defeated.

It is truly a land of magic, but even more than that, it is a land of stories, from the mundane anecdote between friends to the world-spanning epic. And every story has a happy ending.

But a happy ending doesn't always mean a happy beginning, and it certainly doesn't mean a happy middle. Celestia has manipulated Equestria for over a thousand years to ensure that the dark times are as short and as painless as possible - though doing so may mean breaking every one of the tenets of harmony she preaches.

When faced with a choice between seeing Equestria fall to darkness with the promise of salvation, or fighting to stop the catastrophe by sacrificing the guarantee of a happy ending, Celestia holds the fate of her little ponies in her hooves as never before.

A behind-the-scenes look at Celestia and Luna's actions throughout Season Three.