This story is a sequel to One Wish For Nothing

She was once known as Princess Celestia; now, all call her Hecate, Empress of Clockwork World. Her machines soldier endlessly on, rebuilding a mechanical world for her subjects of steel.

But when a young pony colt is brought to her, to be taken in and hidden from the rest of the world, she finds herself struggling between ancient maternal instincts... and bitter memories of what happened to the last child she dared to care for.

Fourth story in the Songs of Lost Children series.

Five years of cheap thrills in the big city have left Sweetie Belle in bad debt with dangerous ponies. Forced to pay up, she returns to Ponyville to seek money from an estranged sister she loathes with a passion.

Featured on Equestria Daily October 6, 2015
Non-spoiler review by Paul Asaran

Strumming Heartstrings of the Equestrian Intelligence Services is on a mission. A mission from ... well, actually she just made one up for herself. Sure, she has her actual job of keeping an eye on Celestia's ex-student Sunset Shimmer, but that's not enough to occupy all her time. After all, Sunset seems to have gotten a bit better about not getting herself into too much trouble. Sometimes. Occasionally.

Thus, when Strumming encounters a mad zebra seemingly obsessed with getting revenge against the gryphons who injured him years ago, it seems like it might be an interesting diversion. Little does she know there's more to this case than meets the eye...

A reader's poll in Equestria's leading newspaper rates the Princesses by approval ratings.

OOC meta humor ensues as the four discuss the findings.

Pre-read by RT Stephens, MythrilMoth, and The Albinocorn.

This story is a sequel to Days of Wasp and Spider

Believed dead by their creators, the ponies that will become Celestia and Luna have broken their mental conditioning and escaped into the wilderness. Here they plan the revolution that will free all ponykind, knowing that it is only a matter of time before their ruse is discovered.

Back in their underground arcologies, the ponies' erstwhile masters deal with the consequences of the escape, all the while unaware that something lurking at the bottom of space-time wants them all dead.

A Soot-Covered World, book 2.
Canon species only/no humans.
This story has nothing to do with the Holocaust.
Art by InLucidReverie, used with permission.

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.

After the Changeling invasion, Celestia and Luna make the decision to have Twilight investigate the Elements of Harmony and solve the mystery of their power.

A thousand years later, Rainbow Dash awakens in a world she does not recognize. She has no idea how or why she came to be there. She does not know the language, the geography or any of the rules of this new time. She soon finds allies in Star Fall, a scholarly pegasus whose Talent is Magic, and Astrid, Star Fall's Griffin guardian. Together they set out to discover why Dash has been sent to the future, and how she might return to when she belongs.

War threatens the nations, a Nightmare stalks the shadows, and Rainbow Dash's arrival has turned her into a wild card in a deadly game that pits the law on both sides of a broken Equestria against a mysterious criminal figure, Max Cash. Yet the stakes are higher than anyone knows, for in her research Twilight Sparkle discovered a dark secret about the Elements, something that will shake the foundations of the world.

Cover image by SierraEx
Has a TvTropes page

She was a unicorn on the run. Being hunted, her only option was to hide where they wouldn't think to look. Once over the border she'd hide in the most quiet, boring, unassuming town she could find in Equestria. Her information was out of date but how much could Ponyville have changed?

Once there all she'd have to do is keep her head down and not draw attention to herself. Certainly stay away from any adventure or authority figures, top of which being the Princesses. She'd shuddered to think what would happen if they found out who she really was. Still, what were the chances that she'd be dragged into an adventure or meeting any princesses while in Ponyville.

Thank you to 'Greynoise' and 'Starlight Nova' for editing and pre-reading respectively.

Having re-read the FAQ rules, now rated for Teenage-Gore.

100% Approved by Twilight's Library!

***WARNING*** Spoilers in comments

No idea who did cover art, let me know and I'll credit you.

Celestia decides to see just how right she was in her choice regarding Twilight's ascension. But upon stepping off the Cutie Map, the world is shattered and she aims to find out why.

If you're interested in more, Apathy is the sequel.

This story is a sequel to Pulse

Celestia betrayed Twilight's trust. Even after begging and demanding Celestia to kill her, Celestia stole Twilight's mortality from her again. Forced to stay alive, and a student under her unwilling tutelage, how will Twilight cope with watching her world die again?

Thanks to SpiritOfDancingFlames for making the cover art, and for helping me in editing the remaster of this fic.