Twilight has been having her study sessions with the Cutie Mark Crusaders for some time, and has been remarkably pleased with their progress. And kind of worried, as they keep getting better and better. She might be a princess now, but TEACHING THE CUTIE MARK CRUSADERS? She'd rather not become their formal mentor. Yet.

A letter is sent out, and Princess Celestia gets a call for help. And, an opportunity is born. After all, why not? After a thousand years, perhaps it is time to do something else, just for a bit. She does have a rather wonderful younger sister who hasn't been ruling a land for a thousand years, and who has been studying how to rule for the past four rather intensely. So, teaching three fillies undercover? Sounds like fun.

And Luna. She's wanted to be as respected as her sister so much that she once went mad over it. But now, she's simply being handed the power that she once coveted for so long and no longer wants. What kind of a world does she live in now that her highest desire has been so casually granted?

With all of this, What Could Possibly Go Wrong?

Arcs:

Escape: When Celestia hears the call, she jumps at the chance to teach again, especially three fillies who might surpass her grandest student. But first she's got to escape her own identity...
Examination: So you want to find out what a filly does? Time to test her silly, so long as you don't taunt the Happy-Fun Filly.
Excitement: So, you've found the Happy-Fun Filly. Great, but the other two need help as well, and Scootaloo has this ~Great!~ idea for how to use her new-found magic...
Encouragement: Cometh the Bubbles, and a whole load of new headaches as they find out just what being a Happy-Fun Filly really means...
Exaltation: Where's Luna been this whole time? She can't be very happy about being left in the lurch holding Equestria. She could really use somepony to talk to.
Exercise: 'Sunbeam' is looking to teach the Happy-Fun Filly more, but first she needs to start taking care of the wagon-tire she keeps around her middle so that certain Unfun-Time Fillies don't interrupt her. And there's this big draft stallion looking for help...

It's been uncounted millenia since the last of Twilight's first friends passed away. Even their names have passed into legend and myth, forgotten by the slow march of time. Now on a far away planet, she finds her musing upon all of her friends over the long years interrupted by her latest faithful student, Calming Waltz.

Now if she can only get that silly pony off to her wedding, and maybe teach her something about why her romance and wedding to come is so special and wonderous... Or at least something for Twilight to get a laugh out of, anyway.

Twilight's in some pretty deep trouble. It's bad enough that she put on a lot of weight, really let her mane go, and seems to have picked up a bad habit of chewing on anything. No, that really doesn't compare with the claws that have replaced her hooves, the fact that she can stand up to about 25 meters tall, breathes fire, and had an involuntary species reassignment spell cast on her.

Mostly thanks to Trixie, looking for means to prove herself the more powerful of the two, they've both found their ponyhood lacking due to a transformation into dragons by the Bag of Tirek. Worse yet, Trixie has fallen to his corrupting influence, and become his new lieutenant in the world, preparing to release him from his adamantium tomb.

Now, it is up to Twilight and her friends, and anypony else they can drag kicking and screaming into the fight to catch Trixie and save her from her from the taint that has corrupted her, and that threatens to corrupt the world. A tall order, to be sure; but when the odds becomes so great, the fight needs to go big, lest ponykind go extinct.

"Is anypony out there? Please, my name is Trixie! I need help! I think... I saw a cockatrice. I can't move, I can't see. Please, somepony, anypony.... Help me."

Laid low by circumstances beyond control, trapped in a cruel and unrelenting prison of flesh made stone, can anypony hold out hope to see the day once more? When their life rests in the hooves of one whom they tried to humiliate and belittle, can they trust in them and make it right? When they can only see through the eyes of another pony, when only one other can hear them, can they stay sane? When the only chance for their freedom is a fool's hope made incarnate, the impossible made improbable, can they beat the odds? Trixie is going to find out.

Pride can lay one low. Stubbornness can leave somepony friendless. Anger and Sorrow can turn others away. And yet, they can give strength. And Hope, in the darkest hours.

If you're afraid of Dark tones, or find them distasteful, or can get stabbed easily in the feels, I suggest reading on only with caution. This is not a happy tale.

Transformed into an alicorn against her will, Twilight’s peaceful world is shattered when she discovers that she’s considered a threat to the throne of the Two Sisters. With her friends nowhere to be found, Twilight must set off on a journey to find the truth behind her transformation, and why her own country considers her an enemy.

Old wounds will be opened, new friends will come forth from the shadows, and Twilight will discover a truth that will shatter her view of her mentor forever. Yet unbeknownst to her, this was her destiny all along.

This fanfic is heavily based on Equestria-Prevails artworks and fanon material. Any credit for the Characters, Locations, and Art that belongs to him must be directed at his page on Deviantart. Any other art will be credited to the respective owners on the author's note section of each chapter.~

I also have to give my thanks to a few guys who are helping me with this:
The awesome Bulder for Proof-Reading chapters seven through thirteen;
The amazing Vexy for revamping the long description;
The fantastic ymom2 for proof-reading from chapter two towards six;
The lovely Divine Path for helping me with rephrasing.

Cover art credits must go to ~Nalenthi

This story is a sequel to Past Sins

Touch, Smell, Taste, Hearing, Sight

This is the order the five senses develop in for foals as they rest, cradled in the warm safety of a mother’s womb. But for one, her womb was a thorn bush in the dark of night. For one, the safety and warmth that should have carried her into the world was replaced with pain and cold.

These are Nyx's first hours.

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?

Rarity returns to Ponyville from a business vacation in the camel homeland, bringing gifts for all her friends. Amongst the souvenirs, Fluttershy receives is a beautiful, blue bottle. Yet, upon taking the bottle home, she quickly discovers it contains something magical: a genie.

How will Fluttershy use the three near-limitless wishes she has been given, and why does this feline genie's smile seem to mask more than it reveals?

Written to be somewhat episode like. Was apart of the FimFiction LOEG Story Swap of August 2012. Originally appeared on Ninestempest's account

This story is a sequel to Past Sins

Side-story to Past Sins - Slowly, the wounds inflicted by Nightmare Moon's reign heal. Ponyville is being reconstructed, and the last refugees are leaving the castle. Nyx is with Twilight. Celestia and Luna rule Equestria and guide the sun and moon once more. Everything is as it should be.

But some things are never washed away. These are the things that remain to remind us of the past. They remind us of the good times we've had with friends and family. They never let us forget the mistakes we've made. Everyone has them. Twilight has them. Nyx has them.

And, on occasion, when you share your scars, your photos, and your trinkets with another, they just might share theirs in return.

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?