It is the year 2038, and the Earth is slowly being consumed by a space-borne monstrosity dubbed the Black Tide, which is using nanotechnology to remake the planet into something hideously alien.

Erin Olsen works for Project Harmonics, humanity's last-ditch effort to find a new world before the Tide can wipe them out. But when that world is found, and it turns out to be occupied, Erin will need to find the courage to face the unknown in order to save the inhabitants of both worlds.

(Many thanks to Easteu for the fantastic cover image for this story!)

Now with its own TV Tropes page

There is now a follow-up to this story: Sunflower - Side Projects
Sequel: Project Sunflower: Harmony

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.

A collection of deleted scenes and side stories that fell outside of the Onto the Pony Planet arc.

Coverart is by the talented RubleGun

Since her return and rescue, Princess Luna has been looking for some way to properly honor the six mares who saved her from herself, but nothing she has been able to think of has seemed meaningful enough to repay her saviors.

Nothing, at least, until she spends Nightmare Night in Ponyville, and gets to actually know the six ponies to whom she owes such a great debt. She realizes she enjoys their company, and wishes for them to spend more time with her, that she might grow closer to them.

So, in accordance with many fine and ancient traditions, and after thinking it over for a good...couple of hours, easy, she proclaims that she shall marry all six of them. Oh, and that Twilight will be marrying Celestia, too.

Now would be the appropriate time for everypony to panic.

--Cover Art Courtesy of Zemious--
--Editing Graciously Provided By BronyWriter--

NB - The sex tag is in place for sexual situations and suggestions; the story is, and shall remain, free of explicit sex.

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.

This story is a sequel to The Sword Coast

The shadows of the past plague the present.

Twilight Sparkle stands on a precipice, one false step from a dark destiny. Months ago, she set out to find her foster father’s murderer. After she defeated the Black Knight, she was hailed as a hero, but what she remembers most is the lives she took. On the path of strife, she discovered more about herself than she ever expected.

With her friends by her side, Twilight sets out for Canterlot, seeking the villain responsible for the death of her father and the crises that plagued the Sword Coast. On the way, a sadistic spellcaster interested only in power intercepts her and promises to unlock her potential. In the aftermath, Pinkie Pie is taken captive by the secretive wizarding order that rules Canterlot.

Twilight’s journey takes her through the doors of a prison and into the depths of a forgotten place. She encounters horrors made from nightmares and soul-stealing beasts raised from the black of the Abyss, but what she fears most is the monster within. How far will she go to save her closest friend?

Featured on Equestria Daily
Cover by Bluest Ayemel
"I love this fic. Keep it up!" – Sethisto (on the EQD page)

Side stories: Tales of the Sword Coast

Warning: Comments contain spoilers. Proceed at your own risk.

In which Shining Armor receives a promotion, Princess Cadance reunites with an old friend, and cloudfall is finally made. Part of the "Cadance of Cloudsdale" cycle, now with its own group!

Pony Joe awakens before the dawn each morning, readies himself for his day, and then walks through Canterlot's cold and silent streets to his doughnut shop.

Life has become pretty mundane for Joe, but as he serves his customers and chats with his regulars he realizes that he has come to rely on that repetition...he relies on it to keep from remembering.

As a casual utterance by a new customer sends Joe into a spiral of haunting memories we learn about his life...and what he must give up if he wishes to move beyond his past.

Obiter dicta -- things said in passing.

A collection of short stories, vignettes, and delete scenes, mostly based in the Civil Serviceverse and tending to be either slice of life or comedy. Also contains contest entries including FanOfMostEverything's Imposing Sovereigns.

Currently contains:

1. An Afternoon For Dotted Line [slice of life] [comedy]
2. The Game The Princesses Play [comedy]
3. On the Inaccuracy of Proverbs [slice of life] [comedy][sad]
4. The Nature of War [history]
5. On Forensic Accounting & Choral Singing [comedy]
6. Hoofprints [human][sad]
7. Dr. Spinning Top—Specimen Annotated Daily Schedule [slice of life]
8. Love and Other Acquired Tastes [comedy][sad]
9. Any Other Business? [comedy]
10. Songs Like Snow [romance]
11. Civics [comedy]
12. The Other Princess [slice of life] [comedy]

In which Cadance I of the Restored Empire is given a very unusual Hearth's Warming gift.

Now with a Spanish translation by the gracious SPANIARD KIWI!