Princess Celestia and Princess Luna are leading together a combined Army of several different equestrian Races against an supposedly terrifying and unfeeling Enemy.

What kind of Threat are our beloved Princesses are really going to face?

A Warhammer 40K/MLP:FIM Crossover.

Special Thanks goes to ARchy4288, Tyrannosaurus_Tux and AlicornPriest for Editing, Proofreading and otherwise helping.
I can only recommend those guys.

Edit: Now a collaborative effort with Loyal2Luna

Commander Shepard has been through a lot, but now that the Reaper War's over he can finally relax and take a little R&R, right? Soak up the sun, grab a few drinks, spend some quality time with Tali, introduce a new race to the galaxy... wait, what?

In the aftermath of the war, a new species has been discovered amidst the destruction and fire. A species that have access to powers never seen before, powers which could prove vital to the continuation of galactic survival.

The Citadel Council has elected to send Shepard, along with the rest of the crew of the Normandy, to introduce Equestria to the universe outside of their solar system.

Now Shepard must wade through obstructive bureaucrats, antagonistic journalists, and the odd, angry prince in order to bring Equestria into a new age of space and adventure.

So settle in, it's going to be one hell of a vacation!

Now has it's own TvTropes page

It is 1945, nearing the end of World War 2. An army has made it's way to Berlin, and the city has fallen. But this is not the army of the Soviets. This is an army of Equestria, seeking to end the war of attrition by stamping out the human pestilence. Wehrmacht Hauptmann Herman Schott stands atop the Reichstag as the last human in Europe, waiting for the Equestrian to claim him as well. With nothing but the captured flags of conquered nations, a Luger, and some stick grenades, can he make a final tribute to humanity that will not be forgotten?

A simple one shot of a conversion bureau story.

My Little Pony belongs to Hasbro.

UPDATE: Added Der Koniggratzer Marsch acompaniment video as an afterthought.

In response to threats of a griffon attack on Equestria, Twilight responds with a letter detailing just why such actions would prove unfavorable for them.

An object of unknown origins crash lands in the no-pony's land between Equestria and Gryphon territory. Princess Luna and Twilight Sparkle race to beat the Gryphons to the crash site, but discover more to the crash than they originally thought.

A convicted pony is sent to starving city of Leningrad in 1941 as punishment for his crime. He can only go home when the siege ends, and if he survives it. Stuck in the shattered city for an unknown length of time, he keeps a journal recounting what he sees in during the battle; from the greatest act of heroism, to the darkest act of cruelty.

Snippy has been through a ton of things. He's been near death at least four times, and if he remembers correctly, he's even died at one point. He wasn't a big fan of his new-found friends, but it beat being alone for the rest of his life in a world that died a long time ago. A guy who is almost completely insane, trying to teach you the 'magic of friendship ', a Captain who was a living 404 error and a doctor who was the Captains 'intern'. How could you be a fan of a group of people like that?

During a scavenging run for extra supplies, Snippy comes across a strange anomaly in the city of Capteinia. Unfortunately, The Captain, Pilot, and Engie end up following him inside the rift in time and space, landing them in some place they never thought they'd see before. Of course, with the crew Snippy has been travelling with, nothing is going to be easy, nor will it be normal. But hey, who likes normalcy in today's society?

Twilight was having just an ordinary day in Ponyville, until a random clay man appeared in her house. She does not really know what to expect.

A Klay World crossover.
Thanks to Robert Benfer for creating Klay World!
Cover image stolen off Google and I am now on FBI's most wanted.

Sergeant Gary "Roach" Sanderson and Lieutenant Simon "Ghost" Riley of Task Force 141 are revived in Equestria after being K.I.A. on the Russian-Georgian border. A massive combined evil force threatens to destroy the nation, and now the two must defend the ponies. Is there more to their arrival though?
Crossover with Call of Duty: Modern Warfare. Takes place between episodes 12 and 13 of Season 3.

This story was granted to me by JWR832, since he was unable to continue it. So, as one of his editors, I will be taking over. I will be consulting with him often, and he will be helping me change it to his liking. For my own purposes, all cursing (other than a few British words) will be omitted. I'm sorry if you don't like this, but it's just the way I write. Thank you all for supporting him, and I hope I can do almost as good as he did. This fic was just too good to die.

Featured February 5th, 2014. Keep it up, guys!
Reached 400 likes 11/11/14! Thank you guys!!!

Practice makes perfect. And Princess Twilight wants everything to be perfect. Especially the end of the world.