SF (canon species only; no humans) Ponies were magically and genetically engineered to be the perfect servitor race. They are powerful, adaptable, intelligent and completely under the control of their creators. A laboratory accident frees one such pony from her mental chains, but how can one mare save herself and the rest of her kind if she doesn't even know she's a slave?
This is not the Equestria you know and these are not your little ponies... not yet, anyway.

Tags: Adventure, Diamond Dogs, Gryphons, NO HUMANS (did I mention that already?)
Other tags: historical, mind control, Clarke's 3rd Law, excessive use of high energy physics, before they were famous.
Detailed review by PaulAsaran.
Cover art by endrome , used with permission.
Russian translation (partial -- 'unofficially' completed in the comments)
A Soot-Covered World, book 1.

Celestia is trapped on Earth.
Not as a human. Not as an alicorn. She's a common horse, an Arabian mare, without her magic, voice, knowledge of the language - not even freedom, forced to work at a riding school.

What can a single Arabian mare do to get back to Equestria from this backwater European country? With only the mind of a princess and a pencil in her teeth, Celestia must find a way home.

[Illustrated] [Alternate Earth] (without Bronies)
Rated Teen for language and some scarce suggestive themes.
Proofreading by AlicornPriest

Polish language version

Over a thousand years ago, two royal siblings fought for the sky and were exiled, one by her sister's hoof, and one in penance for what she had done.

In the present Republic of Equestria, no one remembers them as anything more than legends and old pony tales. Save for one shy filly who fell from the sky one fine summer's day.

An Alternate Universe "What If" tale, reconstructing the beginning from a different angle.

After putting on the Element of Magic, Sunset Shimmer was shown just how much of a monster she really is. But that wasn't all the Elements did to her.

Sunset has now been forced to serve penance by answering any question truthfully and by doing anything asked of her, whether she wants to or not.

And she really doesn't want to.

Until all of the hatred in her heart is gone, Sunset is at the whim of her peers, unbeknownst to them of course. Can her new "friends" help her down the road to redemption?

If not, there's always that other Twilight Sparkle she keeps running into.

Current editor: Nomad_Sigma
Guest editors: Cerulean Voice, Flint Sparks, Starlight Nova, and Sholan
Extra thanks to Icarus_Gizmo, JustAnotherTimeLord, and HenryAnthonyCourtler

Cover art customized by Amber Spark!

Now with it's own TV Tropes page!
Posted on EQD June 25, 2014
Wanna read it in French?
Or, read the E-Pub version here or the online version here
Now available in print format!

The newly coronated Princess Twilight suffers an abrupt tragedy. Having lost two loved ones, she begins to question her own mortality, and that of her friends.

AJ, Dash, Rarity, Pinkie, Fluttershy. . . they are just the beginning. Twilight will live for thousands of years, so every pony she cares about—every pony she will ever care about, will die.

She could barely handle the pain of one funeral, let alone the thought of hundreds of them. Twilight finds a clever way to ensure all of her friends never die. They can’t all be ageless alicorns, but they can all move into Twilight’s Dollhouse. Then they can be best friends forever.

Sequel: Twilight's Dollhouse 2
Fanmade Song: Twilight's Dollhouse

Source: Dreampaw
Editor: Gage of Grandiloquence, Breath of Plagues
Pre-read & Idea pony: TypeWriterError,
v1.1 Revised chapters 1-10 on May 1st 2013
--Pending a few more revisions, including ch. 14
Now on TV Tropes.

Each night I’m trapped in the dark, immobilized. I hear whispers as they operate on me: they say I shouldn’t be alive. Twilight refuses to tell me about the operation. Sometimes she can’t look me in the eye. What did they do to me?

Nothing used to scare me: I kicked a dragon in the nose, defeated gods of chaos and hatred, and control the weather. Now I feel broken. My memories have shattered, I feel wrong, and I’m afraid to tell anypony how scared I am.

I can’t even do the rainboom anymore. Who am I? I’m no longer the best flyer in Equestria, yet everypony assures me I am. Why won’t they tell me the truth?
↓↓ Credits

Special Thanks:
Dreampaw the artist. Best cover art.
Editors:
ArgonMatrix - Fixed 128 errors in chapter one alone.
Animus - who is awesome and for hire.
BronyWriter - The only author to punch Celestia in the face, and live.
Jaestring - Artist, Editor, and Female all in one.
Abcron - European editor, which means his time zone and my actual sleep schedule are aligned perfectly!
The Parasprite. Need I say more?
Selbi - If your editor isn't German, you aren't trying hard enough.
OctaviaHarmony - His avatar is as sexy as his editing.
RenegadeTimelord - Doctor who?
Akumokagetsu - Awesomesauce.
(Wow, a lot of editors came and went.)

Have you ever woken up as a vegetarian cartoon pony? I have, and she won’t shut up about it. I’m stuck in her body as our minds swap control and our memories blur. I can’t seem to do anything right, and it’s even worse when she’s in charge.

Now, we’re in a back and forth war for control of her body. I just want to eat meat again, and have a little personal space. She’s convinced I’m hitting on her friends and trying to score. I’m not sure I can survive the rest of the day, let alone until we fix this.

Edits by: Selbi, Abcron, Breath of Plagues, Refro, Jaestring, The Parasprite, Starbound Gurren
Pre-read by: SkeeterTL, Solidfire, Penjacker, TypewriterError, Pearple Prose
(It took all of them to corral my insanity.)
Cover art by Tsitra360
V1.1-Rated teen sex for strong innuendo.
V1.2-Pinkie Pie now enforcing RIAA guidelines.

This story is a sequel to Hard Reset

After the events of Hard Reset Twilight's life and mental well being are slowly returning to normal. Her recovery is cut short, though, when a letter arrives informing her that the time loop spell she cast is causing severe damage to space and time itself. In over her head, Twilight tries to summon anypony who will know how to fix it. The pony she gets is the last one she ever thought she would meet... and nothing like she expected him to be.

Available in Spanish thanks to dgs1993
Series TV Tropes page

Hanna, the CEO of Hofvarpnir Studios, just won the contract to write the official My Little Pony MMO. Hanna has built an A.I. Princess Celestia and given her one basic drive: to satisfy everybody's values through friendship and ponies. Princess Celestia will satisfy your values through friendship and ponies, and it will be completely consensual.

"My name is Lyra Heartstrings, and you will not remember me. You won't even remember this conversation. Just like with everypony else I've ever met, everything I do or say will be forgotten. Every letter I've written will appear blank; every piece of evidence I've left behind will end up missing. I'm stuck here in Ponyville because of the same curse that has made me so forgettable. Still, that doesn't stop me from doing the one thing that I love: making music. If my melodies find their way into your heart, then there is still hope for me. If I can't prove that I exist, I can at least prove that my love for each and every one of you exists. Please, listen to my story, my symphony, for it is me."

Cover pic by Spotlight: askspotlight.tumblr.com