I don’t know if I’ve truly died or lost my mind. What is reality, what is sanity? Are they not just a product of society, a unit to be measured? Something that can be judged, evaluated, and constricted by belief, but also something that is limited by our very biology? I’m not really sure, yet I believe myself to be sane, and have decided to embrace my own reality. One born purely from thought, bound by the limitations of my imagination. This… is a tale of ”my” reality, my triumphs, my mistakes, and the sins of a father.

(This is a Crossover with Halo. If that genre offends you, you need not read any further.)

Cortana has several problems, and very little she can do to solve any of them. Being stranded on half of a ship in deep space, with the clock on her lifespan slowly running out, she gets desperate enough to try almost anything.

She goes so far as to land her half-ship on a strange astronomical anomaly, in the slim hope of finding a method of FTL travel on it. Now, her latest problem consists of understanding the mind-bending physics of this planetary crime against reason, without prematurely going insane.

Chief wakes up on a new planet, and is, as always, presented with aliens he needs to kill in order to accomplish his mission.

Equestria witnesses the arrival of a large object from space, and has to deal with the fallout of it's destructive crash landing. Though the real threat the object poses is not something anypony could have anticipated.

(Knowledge of the Halo games is advised, though not strictly required.)

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Rated Teen for gore... rating may be subject to change, we'll see.
I am currently looking for an editor, pre-reader, and/or proofreader, preferably someone who can double check me on the lore when it comes up. Shoot me a PM if interested. I've got a few people who have generously offered their help. Thanks for offering to help make this as good as it can be!
Will update tags as story progresses.
Fair-warning, this story is secondary to my other one and will update less frequently.

When a human’s house crash lands on the outskirts of Ponyville, nopony is quite sure how to react to this strange creature. With seemingly no way to return home to his own world, one young man must adjust to this strange new world, and the world must adjust to him.

Starts between Fall Weather Friends and Suited for Success.

Three years after the 'Cupcakes Massacre', Pinkamena Diane Pie is held in the Canterlot Prison for the Mentally Unbalanced. The state declared that ponies like her were beyond treatment or reason... but one doctor took interest into the mare's case and wanted to crack open her psyche in order to better understand her actions. Soon, a mental game of cat and mice takes place; in which you never know when one will be cornered.

~ Sequel: Dysphoria

[Cover image by LavosVsBahamut]

A creature of old has been present in Equestria since the beginning of the rule of the alicorns, watching, waiting. He saw their fall and the sisters' rise to power. Now, for the first time in eons, he steps from watching and takes action.

The Death Korps of Krieg, seeking atonement from their government's betrayal decades ago, they give their lives willingly in the everlasting fight against the enemies of the Imperium of Man. Averted by even their fellow Guard regiments, they show a high degree of fatalism and an unusual morbidity of habit. Yet they are highly disciplined, morally reliable and self-sufficient soldiers.

The 42nd Siege Regiment had been deployed on Kheltan III to reclaim a supply route that had been attacked by the Eldar. A simple enough task for the stoic men of Krieg. But an ion storm attack and an innocent experiment by an alicorn from another world can make even the easiest of tasks much more difficult.

A Warhammer 40K/MLP:FIM crossover

October, 2179. The USCSS Alhambra has discovered a distant planet amazingly rich in precious ores and minerals designated as "LV-1349."

Mining goes rather well for about a week or so.
Until the entire crew of the Alhambra vanishes.

With a massive payload worth billions waiting to be towed back, the United States Colonial Marines are called upon to investigate the missing crew and bring the Alhambra back to Earth. Their orders also include avoiding the local equine populace as much as possible... but as we all know, sometimes even the best laid plans can go to waste.

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Marked as "Adventure" because "Action" isn't available.

Colonial Marines from the "Alien" universe x MLP: FIM

After the 'Canterlot Wedding' incident the Changeling swarm was scattered across the land, enslaved by pony warlords and slavers beyond the borders of Equestria. Weak, desperate and with only a dozen changelings to her name, Queen Chrysalis resorts to summoning one of the most obscure creatures in mythology; a human.

Thanks to zinger906 for giving me the idea for this story.

No pony is the same after witnessing a work-related death, no matter who they are. The victim was young, eager, fresh-faced, and recently hired. In his last breaths, he let out a scream so heart-rending that the employees who heard it had difficulty sleeping that night. And Rainbow Dash was no exception.

But she's not losing sleep over that. What disturbs her is something far worse—something she said afterwards.

The Lone Wanderer has been known as the man who shouldered the nightmares of every man, woman and child in the wasteland, so that they may live. But when the Wanderer was once again abducted by aliens, he found himself falling, quite literally, into a whole new wonderous world, untouched by the horrors of nuclear devastation.

He has been facing other people's nightmares constantly for almost a decade, it was high time he was allowed to wake up.

Meanwhile, the ponies of Equestria are baffled by a strange object that fell from the sky.

Fallout/FIM crossover. HiE. T for violence and some language.

Now with a TVTropes page!