The immaterium is an unpredictable and fickle aspect of reality, and "impossible" ceases to be a valid term when it is involved.

As such, when Twilight witnesses a fantastical cosmic event occur above Equestria, she immediately investigates. What she finds is nothing short of one of the most dangerous artifacts to ever make its way to the relatively peaceful realm of ponies: a blackened suit of massive armor, marked by the ouroboros.

Warhammer 40,000 crossover inspired by Blooms in the Dust.
Now with a sequel, Forged Anew!

Everypony in Ponyville is happy, carefree, and content with their life on the whole... except one. Rarity harbors a dark, murderous secret. She is Equestria's only active serial killer. She has to balance her fashion life, her friends, and her murderous urges as best as she can. This is the story of her mind.

Edited wonderfully by Kaidan and Kagji5

Now with a Tumblr!

Now with a TVTropes Page!!!

This story is a sequel to The Secret Life of Rarity

After the events of The Secret Life of Rarity, Sweetie Belle must find a way to cope in a world that she does not understand anymore.

There is a threequel too.

Now with a TVTropes page!!!

Cover art by the wonderful Viofriedsebe

A jaded stallion catches the attention of two mares when he moves to Ponyville. Brought together by their shared connection in drinking alcohol, it is both the glue that binds them and the knife that separates them.

Editor: Daetrin
Proofreader: PegasusMesa

Art Commissioned from: ImJustAnotherBrony

This follows the events described in the Cutie Mark Chronicles, with one small change: The Sonic Rainboom doesn't happen like it was supposed to. Six destinies fail to start. But when one door closes, another one opens.

Cover Art by Inspired_Light

This is supposed to be close to Canon, but since history is altered and the characters don't experience many of the events that make them who they are in the show I'm listing this as alternate universe (does that make sense?)
For the same reason I'm listing the OC tag, even though the OCs are the mane 6 living different lives.

Nopony dies, nopony suffers permanent psychological scarring, and no irrational whirlwind romances happen.
If I have inadvertently included somepony's OC I apologize.

Warning: contents may contain Existentialism. The facility used also handles peanut based products and wheat gluten.

What if Discord were God?

Skeeter the Lurker reads Thus Dwell in Joy!

Cover image is Arrivederci, love Discord by CountANDRA.

Celestia decides that Big Mac's barn is an excellent place to sneak off to, to take naps on her days off.
Big Mac decides that Celestia is a welcome guest.
Neither Princess nor farmer ever speak to one another, but the silence sings between them.
(Cover art by GrapeParfait!)

Sequel to The Return of Princess Nightmare Moon! After having made a full medical recovery Princess Nightmare Moon tries her hoof at wooing one of her subjects, Nurse Bandaid. Meanwhile, Chrysalis returns to feed on Celestia, still vying for the position of godhood. (Coverart by Mewaponny!)

All of Equestria is united in celebration for the return of their beloved Princess Nightmare Moon. But when Celestia and everypony else recieve her she's skeletally starved, filthy, and very nearly dead. Meanwhile, while everypony's eye is turned, a lusty Blueblood pursues Twilight Sparkle, intent on adding her bloodline to his own so his family might step closer to godhood. (Alternate Universe, there never was a Princess Luna)

Diablo Crossover.

The Archangel of Justice destroyed the Worldstone to spare Humanity the corruption Baal infected it with. The force of its death knell shatters Mount Arreat and sends Tyrael hurtling across the endless planes of reality. He falls upon a world untouched by Angel or Demon, far from the sight of the High Heavens. So far, in fact, that he fears he will not be reborn from the Crystal Arch.

Wounded and near death, hope appears in the form of two strange creatures bearing the power of night and day.

Tyrael now faces a time of recovery as his power slowly heals within a body fashioned for him by his saviours. Justice Incarnate tastes for the first time the life of a mortal, and it is a strange, confusing experience .He has been left in the care of one Twilight Sparkle to learn of this world.

After all, where better to find peace and harmony than Ponyville?

Act I - The Root of Evil
Act II - ????????
Act III - ???????
Act IV - ???????

[Cover image used with full permission of the owner. Go on, go have a look at Chagial's stuff.]