It shouldn't have been a big deal. Celestia was kidnapped or knocked out or just generally made to seem powerless by whatever idiot with ill intent decided to show up on a nearly weekly basis. As the mighty and immortal Sun Princess, she could escape at any time, but she was happy to play these little games. The daring rescues and bloodless battles gave her ponies such a sense of confidence and purpose!
But this one didn't go as planned. One small, stupid mistake got her thrown to the twisted reaches of the world-prison, Tartarus. Now alone, unarmed, and barely more than mortal, Celestia wakes in a living landscape where everything has every reason to hate her.
And, far worse, she has accidentally picked up a passenger.

Sidenote: This a repost (I tried to go through official channels, I promise!) of a story I wrote long, long ago on an account I foolishly deleted. Back in those days, Tartarus hadn't shown up in an actual episode yet. It's not exactly an alternate universe situation, but it has nothing to do with the canon portrayal of the place.

Super amazing cover art by Cold In Gardez.

When Celestia went on sabbatical into the west, she promised Twilight it would be only a couple of months. A year and a half later, the sun resists control, the country is in ruins, and her teacher is lost in the wilds. Twilight has become the apostate, her faith in her teacher and her teachings waning. In the wake of tragedy, her resentment blossoms into fury and she vows that something must be done. Shadows gather around Canterlot, and old things that should not have been awakened are on the move. The Student goes west, her hope restored by friendship and righteous fury.

The night, at long last, is passing.

Everypony enjoys myths and ponytales, even if they know such things aren't real. Alicorns fighting against a spirit of chaos? An ancient princess trapped in a library under a tree, waiting to be found? Quite enchanting and fantastic tales yes, but nonetheless as fictional as Daring Do and other such stories. At least, that's what Rarity used to think.

She doesn't anymore.

Dedicated to Annuska for being as amazing a writer as she is a friend.

Now a physical book!!!
Patreon!
Based on an old oneshot.
Chapter Art by Arctic Waters // Graphic Design and Typography by Swan Song.

Princess Celestia always knew that Twilight Sparkle was destined for great things, but she never revealed the source of that knowledge, not even to those closest to her. When the day of Twilight's true destiny finally arrives, can Celestia fulfill an ancient promise to save Equestia's past, present, and future, even it means saying goodbye to Twilight forever? How can Celestia refuse her mother's last wish?

Art by the inimitable Harwick

Dust and Harmony is a familiar story re-imagined in a western world called Dust.

Twilight Sparkle was only a filly when Equestria detected the enigmatic Signal. A series of increasingly complex mathematical proofs, the Signal transformed from an intriguing curiosity to reliable evidence of extraequestrian life.

And as it happened, Equestria's exploration of their own solar system was nearly complete. With colonies orbiting every planet and large body, and an asteroid belt filled with miners and prospectors, Twilight's civilization was just about ready to turn its focus outward. The signal was less than ten light-years away, within reach of a daring, experimental voyage. A voyage Twilight Sparkle would lead.

Along with a small crew of the most skilled scientists and engineers Equestria could offer, Twilight is determined to uncover the mystery of the Signal, and brave the final frontier for future generations of Equestrian explorers.

A comment-driven, CYoA story. Please use the links provided in the author's notes of each chapter to vote, rather than the comments.

This story is a creative experiment of mine, one meant to explore the general idea that creativity is often most fostered by restrictions. As a result, I've imposed a number of restrictions on the writing of this story, which I'm stating explicitly here so I can be called out if I break any of them.

1. Brevity is the soul of wit
No chapter may be more than 1000 words long. This wordcount only includes prose, and not the questions/rolls.

2. Every choice matters
When a choice is offered in a chapter, at least one sub-optimal choice must be present, with no indication about which is which other than the prose itself. Every chapter should end with a CYoA-style decision tree when possible.

3. Fate is cruel and the universe is heartless
The decision of the vote must be respected. This means any character could be killed, or the entire story could end in failure, if that's what the votes decide. Where numbers, stats, and randomization appear in the text, these elements are not verisimilitude, but are decided by public diecrolls in my discord server.

Note: Because of the unusual production of this story, its chapters won't be edited in the same way as my usual fare. Feel free to point out any mistakes you encounter.

Awesome cover by Zutcha as you can probably tell. Editing stuff by Two Bit and Sparktail, where applicable.

Princess Twilight Sparkle discovers a centuries-old mystery hidden in the Royal Archives. Her investigation leads through layer after layer of deception and misdirection, setting her hooves on a path that seems to be leading to a mysterious secret. Along the way, she learns that some friendships can be very, very strange.

Book 1 of the Alicorn Adventure series.

AUDIOBOOK by VisualPony
Featured at the Royal Canterlot Library
TV Tropes Page (Courtesy of Sandtalon)
Goodreads Page (Courtesy of Facedeer)
Equestria Daily Page

WARNING: Major spoilers in the comments. Takes place several months after the end of season four. (Not a Da Vinci Code crossover, BTW!)

Do you see a dark tag? No, you don't. Not dark. Well, okay, there are a couple of dark-ish bits, but that's all. Not enough to warrant a tag. Speaking of tags, there really ought to be "Badass Twilight" and "Friendshipping" ones.

Sequels and side-stories (and more) can be found here Offprint and AO3, and a hardbound two-volume set of all that can be ordered from The Ministry of Image.

My editor for the first edition of this story was Gogito, and I can't thank him enough for all the hard work he did. My editor for the revised version was PresentPerfect, and he did a terrific job of getting the story into excellent shape.

Although still a novice flier, Twilight has begun to feel comfortable in the sky. But when Rainbow Dash asks her to enter a flying pairs competition with her, she believes that her inexperience will only hinder her friend's chances of winning. Twilight's misgivings deepen when Rainbow learns that two old rivals will be competing as well, and her desire to win begins to drive a wedge between them. Full of doubt of her own abilities and anger toward Rainbow's fierce ambition to beat the others, will Twilight overcome these obstacles and compete with her friend, or will she quit the competition altogether?

This story was accepted by The Goodfic Bin! If you haven't been there, why not check them out once you're done here for some other great stories?