=====Originally Written February 2012===== EQD Post=====
After overwhelming Ponyville's mayor, the main six must fill in as she takes a much needed vacation. Yet, only one pony can take the title of mayor at one time. Which of our favorite ponies will be the first substitute mayor? How long will she be able to last before passing the job to somepony else? And in the end, will Ponyville survive long enough for its real mayor to return?

This story was written as a prize commission for the Smile Album Charity Event. The original prize was one by Stormy Seas and he provided the original premise for this story. He always wanted a story that could be shared and enjoyed by everyone, so be sure to thank him if you know him.

This story is a sequel to Past Sins

Side-story to Past Sins - Spike almost lost Twilight to a hangmare's noose, but now Twilight is safe and Nyx is a filly again. Normal life is returning. Still, Spike can't ignore the fact that Nyx just isn't the same as he remembers her. Her temper is more volatile, and, when she gets angry, all he can see is the rage-driven Nightmare Moon of legend.

And thus Spike has to wonder: Is Nyx truly reformed, or is she one bad tantrum away from calling herself Nightmare Moon again?

==== Originally Written: Fall 2011 ==== EDQ Link ====
After a party to welcome the season of Nightmare Night, the library becomes the target of strange activity. Minor annoyances prelude greater events, and soon Twilight and Spike each take action to handle the situation in their own way. All the while, questions hang in the air. What lingers amongst the shelves? What watches from the corners? What stands just behind you only to disappear when you turn to look?

What is in the library, and what does it want?

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?

Twilight Sparkle is a unicorn, and she has a problem...

Twilight Sparkle is a gifted student and scholar. When she attempts to harness her creative side by writing a science-themed sensual romance novel, however, things rapidly get out of hoof. Can her friends stage an intervention before she humiliates herself (and them) at a prestigious literature recital?

No. No, they cannot.

Twilight awakens alone in a strange and forbidding labyrinth of abandoned halls and forlorn chambers with no memories of how she came to be there. All she has to go on in the dark are a few scattered memories, her intuition, and her Princess's vague warning.

Watch for Luna.

Twilight is beyond the title protege. Prodigies are merely brilliant. Twilight has surpassed most of the greatest mages in history before the age of thirty. Twilight's research has changed the landscape itself. She is a living legend who some whisper may be the greatest user of magic to ever exist... perhaps even an equal one day to the semi-divine princesses.

But Twilight's knowledge is not infinite. She has one final lesson to learn. Twilight must learn the Final Law of Magic.