An undead Emperor in need of a new body. A Spartan lost in space. A ragtag team on a suicide mission. What do they all have in common? They all wind up on the magical world of Equestria, where war has been forgotten. That, however, is soon about to change.
When each of them is about to be retrieved, ancient evils arise to unleash hell upon the unsuspecting world. When the forces of three galaxies clash around them, can our favorite ponies hold out against the onslaught?
This is a crossover involving Warhammer 40k, Halo, Mass Effect and MLP, and is also my first fanfic. Comments and reviews are welcome.
Rated T for language, violence, and general adult situations.
Now on Tv Tropes!

20,000 years ago, a dark king ruled over all of Equis. He was defeated, cast into the void. But now, he awakens, and Equis will never be the same. With his rising, new worlds are discovered, all having been affected by him at some point. They all must band together to stop him, but Luna and Celestia will face the most difficult choice in their lives- do they stay loyal to old and new friends, or to family? Old adversaries return as allies in this fight. After all, the enemy of my enemy is my friend.
A halo and mass effect crossover.
First story in the Lone universe

Rainbow Dash is gone.
Two Years ago she performed a trick to eclipse all others, and vanished without a trace. Everypony has started to get over it, although for five ponies the loss is to great even now. In respect the Wonderbolts do a performance for her at the site of her death. However, a certain Cyan mare is hard to kill, and is loyal to the ends of the universe, she can say that with certainty now, she’s been, and now she’s back. But what is she wearing, and where did she go for two years? Buckle up, for in Equestria there may be peace, but in the 41st Millennium, there is only war.

Now with a sequel: The Descent into Madness

Featured: 06/05/2014. Thanks so much to you guys.

Rated Teen for Violence and Grim dark references

This story is similar in ideas to Into the Black: A mares tale, Diamond of the Capital Wasteland and Halo: On the wings of Angels

New cover art done by Reapers Inc

WARNING: Comments contain spoilers. Proceed into that section at your own risk.

In the chaotic period following the fall of the Covenant Empire, the Shipmaster Vraal Rutaen does his best to ensure the safety of his race. For years he and his crew have fought countless threats, searching at the same time the precious Forerunner technologies on which depends the future of the Sangheili. But this is not enough. The Sangheili, once proud warriors that fought in name of glory and honor, are now without a true purpose to live, risking the extinction. But when they discover accidentally a new planet that defies every law of physics, maybe they've also found the answer to their existential question. All depends on the first contact with the inhabitants.

Chapters 1 to 18 edited by Requiem17.

"Speech."
'Thoughts.'
"Speech in a foreign language." (Ponies hearing Sangheili language - Sangheili hearing human/pony language)

THE STORY IS NOT ABANDONED. I'M JUST TOO BUSY TO CONTINUE IT AT THE MOMENT, SO PLEASE STOP ASKING WHEN I WILL UPDATE IT. READ MY BLOG FOR DETAILS.

It had been one year since Twilight Sparkle vanished in the battle against the evil unicorn Xander, and her friends were still trying to overcome the grief of losing her. On the anniversary of her presumed death, her friends gather at her memorial. What was suppose to be a day of remembrance was shattered by a strange metal object that landed right beside them. Their anger quickly turns to shock as a familiar unicorn emerges... and boy does she have a story to tell.

Rated Teen for violence, language, and sexual content. Rating and tags may change in future chapters.

This is not a Halo fic. It IS however loosely inspired by Halo as well as Star Wars, Mass Effect and several other sci-fi movies, books, and games.

Edited by Jack-Pony, HuskSummers, Coldwall, and sadron

Cover art by Sonic Rain

It has been several months since the disappearance of Twilight Sparkle..

One night, after watching her sister raise the Moon and set the heavens alight, Princess Celestia begins to bed down for the night, only to be interrupted by portal forming in her room. From out of the portal comes none other than Twilight Sparkle, garbed in strange armor.

Princess Celestia, along with Luna, Cadence, and Shining Armor, are overjoyed by the Element of Magic's return, but are justifiably curious as to where she had been and what she had been doing. And so, Twilight begins her tale. A tale of survival against impossible odds. A tale of a people fighting for the most basic right of all sentient beings. The right to exist.

In the aftermath of the Changeling incursion of Canterlot during the marriage of Shining Armour and Princess Mi Amore Cadenza, Equestria gears itself for war against the Changeling menace. Against a foe that can take the shape of anypony, assume their life, and undermine Equestria from within, the Royal Pony Sisters create a new institution to monitor their Royal Guard for any Changeling corruption, cowardice, and incompetence: the Commissariat. As total war rages across the land one hero stands out above the rest; Commissar Blueblood, Hero of Equestria. Or at least that's what the propaganda says. The truth, as ever, is far more complex, as the esteemed Blueblood is merely looking for an easy and sedate life. Unfortunately, fate has a habit of throwing him into increasingly dangerous and suicidal missions, which he must survive with a combination of self-preservation, lying, and sheer blind luck, even if doing so only fuels his soaring reputation!

Equine military fiction in the style of Ciaphas Cain and Flashman.

Cover art done by me.

Proofread and edited by the always dependable Setokaiva.

Sweetie Belle is compelled to learn magic after Rarity promises to teach her the finer art of dressmaking, but only once the young filly has learned the basics of magic. However, learning magic comes with its own set of complications and bears an unforeseen gift that will change Sweetie Belle's life forever.

Here's a one-shot sequel that takes place four days after Scion of Chaos: An Emerald Treasure

And this is a Multi-chapter sequel that takes place 5 years after the events of SoC and AET: A Heart of Change

Here's a poem that's based around the character Red Timber. (Not necessary to read for the comprehension of the storyline): Red Timber

Special thanks to SameAsUsual for letting me use his art: http://sameasusual.deviantart.com/art/Ultimate-Sweetie-Belle-340226445. And to ShadowBro for adding in the title and cropping the image.

Prince Blueblood thought the Grand Galloping Gala was over. He thought he could just go to sleep and put it behind him. He never expected to be reliving the same disaster of a day, over and over... and over.

TV tropes page here:
http://tvtropes.org/pmwiki/pmwiki.php/FanFic/TheBestNightEver

Thanks to all the people who wrote the page and all the people who gave me a little wakeup call and comment to become aware of that fact! You can't see it, but you guys put a real smile on my face tonight.

Also, recently, extra thanks to RD Dash for giving TBNE a thorough editing. I've updated the fic accordingly (7.11.12)

The Elements of Harmony are defeated and Nightmare Moon stands on Equestria's throne as their new Queen. Is Equestria doomed to suffer through night time eternal or will they be... perfectly fine? Twilight finds her new job as slave or "personal assistant" to her new ruler to be a bit maddening. But is this evil sarcastic queen really as bad as she originally believed? And just how many others are diabolical enough to cash in on the change in staff? Can Nightmare truly run a peaceful Equestria? Let me just answer all these questions right here in the description...