You've got ponies in my Warhammer!
You've got Warhammer in my ponies!

It is the bright and prosperous future of the 41st Millennium. For ten thousand years, the God-Empress Celestia has sat immobile within her Golden Throne, watching over the countless billions of ponies that stretch from one side of the galaxy to the other. But the fragile peace of the Equestrium is assailed on all sides by the selfish, the spiteful, and the mad. Her Majesty's Most Holy Inquisition of the Ordo Harmonious stands eternally vigilant, ready to face down all that threatens the Equestrium with the full force of the Empress' compassion.

For young Inquisitor Twilight Sparkle, to study the mysteries of magic has been her life's goal. But now the time has come for her to discover something far more powerful than magic and save a galaxy standing the precipice of chaos. In the future, there is only friendship...and hatred is heresy.

Disclaimer: Not a real-life religion, so there's no need to get all up in arms over a fic with the 'comedy' tag.

Post-Conversion Earth is a calm, peaceful place. However, it lacks the certain kind of chaos that only religion can bring. Enter a single, fanatical human from space to dish out his own kind of conversion.

Religion is coming to Equestria, brought by a single, oblivious, fanatic. On a divine mission from his God (at least that's what he thinks), this lone human will not rest until he saves the souls of all. With zeal in his heart, a holy tome in his hands and unyielding faith, he shall bring the true meaning of conversion back to Equestria.

Whether the ponies like it or not.

So grab your prayer beads, strap on your finest missionary boots and prepare for a preachin' you won't forget.

Arse-covering:
1. I'm not taking any shots at religion here, it's a shame that I have to point that out but better safe than sorry.
2. Any references to actual religion is purely for comedic purposes.
3. Not a hate-fic, I just can't resist the pun.
4. Disregarding the above points is considered heresy, and punishable by eternal damnation.

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There are many legends whispered among the ponies of Equestria, but none are stranger than that of the metal man that fell from the stars. Legend has it that the metal man's suit of armor still exists to this very day, slumbering the centuries away in the Canterlot Archives ...

Takes place during the season four finale.

Here's some quick background info on what you need to know, seeing as the 40K universe is huge and no one can be expected to know everything.

The Space Marine chapter involved in this story is a little known chapter known as the Celestial Lions, who are a descendant of the Imperial Fists. They were targeted for destruction by the Inquisition after defying them on an Exterminatus that was due to purge a world the Lions had fought for and saved. They fought during the Third War for Armageddon mainly, and during the fighting, they were reduced from 950+ battle brothers to just 96. Their numbers are even lower now, due to events that will be explored during this story.

Edited and Proofread by the amazing Loyalist. He's seen some heresy.

Featured on 4/26/15 and again on 7/25/15

Equestria is expanding unstoppably. The Conversion Bureaus are working at peak capacity. It looks absolutely certain that Celestia will replace humanity with ponies.

But then one niggling flaw appears in her plan. You see, humanity's religions, while dismissed by Celestia as just more evidence of human barbarism, are correct in at least one respect. Humanity has a loving father, and what Celestia is doing makes Him angry. So angry in fact, He's going to do what He hasn't done since ancient times: smite.

Seems like Exodus is being reenacted, and guess who's playing Pharoah?

This story is a sequel to Iron Hearts: Book 1 - Planetfall

An MLP/Warhammer 40K Crossover, part 2.

Celestia has handed down her order. The Iron Warriors must be defeated and driven from the planet, lest the corrosive grip of Chaos infect their world. With great reluctance, Twilight and Company depart for the Iron Warriors fortress-factory in order to confront the Chaos Warsmith. However, in this mission it is not the might of the enemy that will be their greatest challenge, but their own burgeoning friendships with the admittedly less-than-saintly members of the 38th Company.
At least until the Iron Warriors actually consider them a threat. Then it's totally their military might that will prove to be their greatest challenge.
All the while, the Tau forces lick their wounds and plot their next move. They are far from defeated, and the Iron Warriors have little inkling as to the aliens' true purpose.

MORE EXPLOSIONS!!

(Dark humor warning; minor grimdark)
(Cover art by Nicholas Kay)
(This series now has its own TVtropes page!)
(This series is a contestant in the Tournament of Canterlot, a charity event to raise money for Syrian refugees! Go here for details and donations!)

This story is a sequel to Iron Hearts: Book 2 - Ferrous Dominus

An MLP/Warhammer 40K crossover, part 3.

The formal negotiations between Equestria and the Iron Warriors have failed. Yet peace and even cooperation between the harmonious ponies and the corrupted militants blooms in the dark corners of Canterlot and the open streets of Ferrous Dominus. The Elements of Harmony are safe, trade flourishes, and cautious meetings grow into lasting friendships as an unsteady calm descends upon both forces.
Even the Tau threat seems to have mysteriously vanished as the Iron Warriors refuse to assault their hideouts and risk springing the traps of the Fire Caste.
But the Tau have not vanished. The Lamman Sept of the Tau Empire, the Fire Caste's hidden dagger, have come to grips with the slumbering giant looming over their doorstep and have moved forward into the final phases of their plan. Fleets ply the void, hunters stalk the orchards, and in the depths of the badlands a strange device is rapidly assembled for purposes unknown.
The Tau alone know that time is running out, and more than just the fate of Centaur III hangs in the balance.

SIGNIFICANT POSSIBILITY OF EXPLOSIONS.

(Dark humor warning; minor grimdark)
(Cover art by Ahrimatt)
(This series now has its own TVtropes page!)
(This series is a contestant in the Tournament of Canterlot, a charity event to raise money for Syrian refugees! Go here for details and donations!)

This story is a sequel to Iron Hearts: Book 3 - The Sept Lamman

An MLP/Warhammer 40K crossover, part 4.

The Tau threat has passed. The fleet that once thought to sweep aside the tainted pirates of the 38th Company has fled the system. The Lamman Sept is broken, demoralized, leaderless...
... And victorious.

With Lamman's plan put into motion, an alien horde hurtles through the Warp toward the Centaur system, its soldiers without number and thirsting for violence. Equestria's heroes must find a way to stop them, or the entire planet will be overrun with ease and its inhabitants butchered. While they could afford some pretense of neutrality and disinterest in the fight between the Iron Warriors and the Tau, now it is their world that lay in the crosshairs of the foe. Ponykind will need help to survive, and they look to the forces of Chaos for aid. But is there any hope to be found in the darkness?

EXPLOSIONS ARE IMMINENT.

(Dark humor warning; mild grimdark)
(Cover Art by Ahrimatt)
(This series now has its own TVtropes page!)
(This series is a contestant in the Tournament of Canterlot, a charity event to raise money for Syrian refugees! Go here for details and donations!)

A prophecy leads the Imperium of Mankind to deploy a Deathwatch team deep inside the Warp. Soon they encounter Equestria and the "Six Blessings" it harbors. How will ponykind react to the fierce and grim protectors of humanity? The two sides will need to find common ground, and fast: a new threat has arrived in Equestria, and they will stop at nothing to see this fragile alliance destroyed...

A Warhammer 40,000 crossover. Special thanks to csimadmax for creating the cover.

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 )

4131 EC, a year of no importance. Thousands of years ago, the entirety of our universe consisted of a single planet, an idyllic world of harmony and peace. Now, the galaxy is a hard place. The Age of Harmony is over, the old order is dead, and all that’s left of our once glorious civilization are fractured states in decline.

My name is Horizon Seldat. I grew up on a slum colony orbiting Luna six. My life just got a little complicated.