Twilight and her five friends are transported during a botched spell, across dimensions to... Ponyville, Equestria? But not the same one that they knew. Sitting on a bench is Harpsy and Babar. The Doctoress avoids apples from an aspiring Applebuck. And in a library across town, six stallions join their forces as they try to decipher the appearance of filly look-alikes of themselves around Ponyville!

It occurred one peaceful night. Half of Equestria awoke to the sound like a double-shot thunderclap. A percussion heard in the skies and rattling windows from Apploosa, to Canterlot, to Ponyville. Nopony knew what it was or what it heralded for the world as it drew a line across the nation.

For Twilight Sparkle, this isolated incident might have faded from memory after a time, if not for the strange rumors of a creature sitting on the hill on the outskirts of town.

These are her thoughts given written form. These are Sparkle's Notes.

Report EVERYTHING to the Princess.

Seven years ago, a man down on his luck met the woman of his dreams. After a one night stand, however, she left him with a lot more than he bargained for. With a pile of questions, no answers, and a hundred new children, Anonymous is left to wonder what to do with his life.

Misery, one of many of the hybrid daughters, thirsts for knowledge. She wants to know about her mother, and more importantly, what her purpose is. The half of her that isn't human needs answers, and to find them, she has to go to the brightest gem in the Mojave.

Cover image is an artist's rendition of Mistake, brought to you by the illustrious DJ.

[Multiple Disclaimers Incoming]
This story has a main character named Anonymous. It also takes place on Earth. And the majority of the characters are "satyrs", which are abominations with pony (or in this case, changeling) bottoms and human tops.
If any of the above things offend you, please do not waste your time reading it and complaining about it in the comments. Alternatively, read it anyways and see if you change your mind.

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?

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?

Under the hospital for girls, there is apparently a forgotten library. The books are still all there, as it had been abandoned.

Had these been regular, conventional books, they should have been withered and worn by now.

The main price of this collection is placed on the pulpet, as if it had been the BoS of a Witch. This book is enchanted. There are large, detailed images within. Under each image, there is a short text. Read it, and you will be forever changed.

There is a girl, who stumbled upon the library, finding the book, curiosity driving her. What was stopping her from reading?

The star system Omega Centauri was just another oddity on a map to scientists in the not too distant future. However when they found the star was orbiting an earth-sized, earth-like planet instead of a black hole as its motion had suggested, a mission was scrambled to investigate this most unusual of celestial behaviors.

Hamstrung by politics, and nearly crippled before it began, the 'Lone Ranger' mission was reduced to just one crew member and left to his own devices.

These are the logs of Arrow 18 and its lone commander. This information is classified TOP SECRET by the Global Space Agency.

Do NOT tell the princess.