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.

There is a world where Life and Death govern all imaginable realms. A world where Watchers guard over their planets and the creatures that roam them. In this world, a young soul goes on a journey to a place he never thought existed, after cutting an untold deal with Death.

Equestria, a place of magical creatures and mysteries, offers him a new chance at life. A chance he will have to pay dearly for. This is the written story of his adventures, some of the sorrows and victories of his life as he goes through great challenges and fights his inner darkness.

At the end of this journey, one begs the question: What is better? To be born good, or to overcome your evil side through great effort and sacrifice?

Tagged with Human for the prologue.

Follows show's cannon up until end of Season 2.

Now a published book!
And it's own TvTopes page!

Spanish translation: Here

First chapter published January 2012
Marked as Complete on 31st August 2014
Published (printed) on 25th November 2014

PM me for the full digital version of the now-printed book! (includes text PDF, full cover and fan art)

Many years after sending her beloved protege to Ponyville, unease sits heavily on Princess Celestia's heart as her relationship with Twilight Sparkle seems to have cooled despite all they've accomplished together. On the advice of her sister, Celestia sets out to investigate and resolve the lost connection with her most faithful student. What does it mean to be a Faithful Student...or a Princess of the Sun?

Earned a six-star rating on Equestria Daily and featured on its very own TVTropes page!.

We all wear a mask called composure, beneath which hides a heart that twists with guilt and hidden feelings. Regal as she is, Princess Celestia is no exception. What might be revealed should circumstances cause this mask to slip - or break?

Set several years after the potential conclusion to the series.

For almost a thousand years, the immortal Nightmare Moon has reigned over Equestria as Empress. To the average pony, Nightmare Moon is an overarching enigma whose rule is absolute and whose wrath is terrible. But to Twilight Sparkle, who as an orphan has never known her parents, the Empress is something else entirely. When the young unicorn is brought under the royal wing as an apprentice, she learns a great deal more about the supposed tyrant than she ever knew. But as Twilight is introduced to life with her new mentor, she is thrust into a world of political intrigue, conspiracies and secrets. Secrets that were never meant to be revealed. As allies and enemies plot against the very peace of the nation, will Twilight fall prey to the perils of her new position? Or will she prosper and find in Nightmare Moon the mother she never had?

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My eternal gratitude to my editor, LordOfTheWrongs, without whom Night's Favoured Child would not be the story it is today.

Now with added TVtropes!

The Princesses find an alien creature barely clinging to life at the scene of a terrifying crash. Can the Combined Power of the Elements of Harmony save it, or more importantly, should they save it? Will the arrival of this strange creature tear Equestria apart?

TV Tropes
https://tvtropes.org/pmwiki/pmwiki.php/FanFic/Article2

At first glance, Princess Luna's charioteers might appear to be little more than Royal Guards dressed in festive apparel for Nightmare Night. However, there is far more to the story than that - the Night Guards once played a pivotal role in the history of Equestria, and have sacrificed more for their beloved princess than most ponies are even aware of.

A young man lost in the hilly embrace of a mountain sleeps the night away under a knot of tree roots. When he wakes he will find himself thrust into a strange new environment, the Everfree Forest. With only his pack and his experience as a Boy Scout to aid him, he must survive, make sense of his surroundings and with some luck, ultimately find his way home. What does one do after wandering beyond the edge of the map? And better yet...

What if you are not alone?

I have been reading fan fiction here for a while and wanted to give something back.
My first fiction ever so constructive criticism is welcome. Fair warning, it takes a while for me to write a chapter so expect gaps between updates.

[Hiatus notice: As of 10/1/2022 this fiction is on hiatus so I may focus on other projects and items, will resume at a later date.]

Rated teen for strong language

Awesome cover art by Carnelian. Seriously, the guy has major skills with how fast he drew this up.

and of course ALL CHARACTERS / REFERENCES BELONG TO THEIR RESPECTIVE OWNERS. “MY LITTLE PONY FRIENDSHIP IS MAGIC” IS OWNED BY HASBRO

NO PROFIT WAS MADE IN THE CREATION / DISTRIBUTION PLEASE DONT SUE ME OR ANY PARTY THAT DISTRIBUTES THIS WORK (unless they try to sell it, then by all means go nuts)

Humans.

Truth or myth? Ancient lost civilization or just an old pony's tale?

No pony has ever seen one, and most haven't even heard of them. But Lyra knows that these wonderful creatures are more than just old legends, and she's going to find out... and possibly drive her roommate insane in the process.

Harry Potter was a lonely boy who one day wished for a friend. Luna, trapped on the moon, wished for the same. And so their wishes are granted. How will the two deal with each other? And what about Nightmare Moon? Needless to say, their lives are going to change in both expected and unexpected ways...

Other stories in the Lonelyverse:
Hooves, Plush, and Magic: The Untold Tales
The Wizard and the Lonely Princess: Hallowe'en Special
A Nightmare Christmas

Chapters 9-11 now re-written.