An MLP/Warhammer 40K Crossover

The Iron Warriors 38th Company has landed in Equestria, entrenching themselves like a barbed hook. They hunt the aliens of the Tau Empire, intent on destruction and pillage.
A small squad is dispatched on a reconnaissance mission, only to find that there is intelligent life on this world besides the feuding space-farers.
Will these improbably adorable and friendly equine aliens turn the damned warriors of Chaos from their blood-soaked path, cleansing them of their dark legacy with the magic of friendship and harmony?

No.
No, that isn't happening.
EXPLOSIONS!!

(Dark humor warning; limited grimdark themes)
(Cover art by Nicholas Kay)
(This series now has its own TVtropes page!)
(This story is a contestant in the Tournament of Canterlot, a charity event to raise money for Syrian refugees! Go here for details and donations!)
(Featured on Equestria Daily 8/20/15 )

To the highly skilled operative code-named Naked Snake, today was not that good of a day. On top of being sent to kill his former mentor in order to prevent the Cold War from going nuclear, he had gotten captured, and lost his eye. While he did manage to escape, there was still much he had to do in order to complete his mission.
Still, even being tortured by someone with inexplicable lightning powers was somewhat preferable to finding himself outside of not only the mission area, but his world as he knew it...

Even the tiniest change can alter the future in ways you can't imagine.

The battle with Lord Tirek did not end the way it was supposed to. The centaur was still sent back to Tartarus as he should have been and Equestria and all of its' ponies were saved, but thanks to one final act of defiance, Twilight vanished without a trace not long afterwards.

One month after her disappearance, Twilight has returned to Equestria, but not in a state anypony was expecting her to. Now they're all filled with questions about what has happened to her, but what tale does she have to share with them? What is she willing and unwilling to tell them?

Can a battered phoenix still rise from the ashes?

Sunset has heard in the news that a series of robberies has been occurring in her neighbourhood recently, but never did she believe that she of all people would be a target.
Upon discovering the thieves invading her apartment however, Sunset finds herself thrust into a cavalcade of awkward situations over who she suspects the robbers to be, as she feels that she can neither ignore the situation, nor entrust it to the proper authorities.

Set after the events of Rainbow Rocks

Princess Twilight Sparkle has died a hero, but no one knows why.

Between an ancient evil that had not even existed until she struck it down, a mysterious crystal ball that bears some unknown significance, and a set of cryptic notes and behaviors from the princess during her final days, the circumstances behind it all are murky at best and suspect at worst.

And the rabbit hole only grows deeper from there.

The Crystal Ball Trilogy is a series of stories which deal with time travel, parallel universes, and other manipulations of time and space. Feedback is the first story; it is succeeded by Substitute and Divergence.

Digital pdf version here
Print book version here

Featured on 7/19/2015!
Featured on Equestria Daily! 8/21/2015
Featured by Everfree Northwest! 3/11/2016
Featured by Seattle's Angels! 9/27/2016
Goodreads entry~

Edited by
PersonalGamer
Kuairu

Live reading by Alchemystudent
Fan-art by Miss Hoot

Five years ago, the Free States seceded. Five years ago, the Princesses were taken captive. Five years ago, Equestria embarked on a bloody war that would cost hundreds of thousands of lives.

For five years, Rainbow Dash has fought to save her friends. For five years, the sun and moon have hung overhead, motionless. For five years, Rainbow has lived in that wan glow, while every day kills her a little bit more. The peace and happiness of her youth are but faded memories, and now she hardly recognizes the town she once called home. A hardened mare, Rainbow knows only pain and suffering...

...until one day, a reminder of what life used to be like lands at her hooves, and gives her something to live for once more.

Cover art provided by Ruirik. Editing provided by Solidfire and Pega-Ace. Written for the 101st anniversary of the beginning of World War I

Twilight Sparkle broke time when she got her cutie mark. Now Twilight and Sparkle are sisters from another time. Twilight is hailed as the potentially greatest light magician of all time, and already has a reputation as a hero by the time she goes to Ponyville. This isn't her story, not primarily.

Sparkle is an orphan - her dark magic killed her parents. She lives with her brother in Canterlot's industrial sector because they can't afford anything better. She can't leave either. She's a natural dark mage; while Sparkle won't go mad like Sombra, her reputation is hardly any better. Worse, the law doesn't see her as a good pony.

The fact that the dead don't stay dead around her, or that Thorn - Spike's double - is an undead, soul-eating abomination, are other matters altogether.

(Also has some Slice-of-Life, but fimfiction tags won't let me put it with Adventure.)

Has an ask blog to go with it: Ask Sparkle and Thorn.
Also has a TvTropes page: Split Second Tropes.

Featured on EQD.

Cover art by Swirling Line.

The wheel of time turns, as destiny and history clash together.

Fifty years into the future, Sunset Shimmer is Princess Twilight Sparkle's most faithful student. She is smart and eager, but doesn't always think things through. Her life had been perfect, right up to the End of the World.

With a ruined future, Sunset travels into the past to alter the course of history. With only her mentor's cryptic word to go on, Sunset and the Elements of Harmony must solve the riddle of the Dark Regalia and stop the mysterious Vesper Radiance from rising to power. But the further Sunset goes, the more she feels like she's been through it all before.

Is destiny set in stone, or can Sunset shape her own future? Only time will tell.

Featured on Equestria Daily 6/16/13
Gratefully edited by JustAnotherTimeLord, Icarus_Gizmo, Cerulean Voice and Bad_Seed_72

The Sunset of Tropes page!

Sunset Shimmer is having the worst day of her life. She used to be important. She was the personal student of Princess Celestia. She was a future leader of Equestria. She was the kind of mare that everypony envied.

Today, it's all crashing down around her.

Alternate Universe: What if Sunset Shimmer hadn't gone through the mirror?

This story is a sequel to Post Nuptials

In the aftermath of the wedding, Spike is bitter and avoiding everyone. Twilight's determined to find out what's bothering her charge, but she walks a very fine line when dealing with an emotionally distraught child.

Meanwhile, Rainbow Dash suspects something's wrong with Scootaloo, so she starts spending more time with her in hopes of picking the secret from her brain. As she begins to truly mentor the young filly for the first time ever, she begins to see the advantages to having a little sister.

And while all this is going on, Pinkie is struggling with some old family issues that have been brought to the surface, meaning she might have to confront her past at last.

Art by Conicer