Crossover between two opposite universes and a collection of their most explosive adventures.

Everyone knows who he is. The sudden storm that shook NC right at it's foundations. People have called him many things, inhuman, monster, underdog, edgerunner, dragon. But truthfully, his story started a tad bit tamer that you would've expected. He'd just been playing LoL when some random RoB decided to chuck him in the body of a Primarch and dump him in right in Night City.

Book IV of the Infinite and Divine. A young agent of the Holy Inquisition finds herself on the trail of the most dangerous person in the Imperium of Man. As Cadia burns and the galaxy tears itself apart, a young interrogator searches desperately for Taylor Hebert.

In the grim dark future of the 40K there is only war, and the infinite laugther of thirsting god. Finally able to go back home after so many year of endless carnage and misery, Loona now forge in the flame of war and the multiple attempt of corruption by the four, can finally lay her weapon down and rest, or thats whats what she tought...

The Technocracy knew something was out there, watching the galaxy from a place no sapient can point to. It was not until two empires gained powers from a place known as "The Shroud" that further research indicated that this Shroud could connect universes. We will prevail for all of humanity. WARNING: Shitty dialogue and Warp Shenanigans abound (mainly Tzeentch and Slaanesh)

While it has been said in the 40th millennium there is only war, in the dawn of the 42nd century there is Hope, and from this hope, fragments of the Emperor's Soul spawn five daughters. They represent the arcana: The Star, Death, Chariot, Strength and the Devil. They bring hope to the guardsmen that maybe things are not lost…

A poor sap gets thrown into Warhammer 40k with the Omnitrix. In the Grim Dark of Warhammer, It's time for a nobody to be a Hero!

One of the God-Emperor’s 20 infant Primarch sons arrives upon the world of Avatar. His mere presence will change the status quo of the Four Nations forever, and drag the realm into a new era of war and imperialism, tearing apart the cosmos…

A battle against the forces of Chaos strands a Necron lord in the galaxy of Mass Effect. With what's left of his dynasty under his banner, Veronakh Lord of Solvatakh intends to lead his people to glorious conquest. Can Commander Shepard stop the Collectors and curtail the ambitions of the Necrons?

For ten thousand years, Humanity stood stalwart against its enemies, fighting for its survival. For ten thousand years, untold billions of souls fought against extinction, spread across a million worlds in an unforgiving galaxy. Thousands of nameless Imperial Guardsmen will die standing for a world they didn't care. Nevertheless, the flames of Humanity will burn bright with valour.

The King of Curses awakens... but, there's just one problem. He has no idea where he is and how he got there. He's also pretty sure that he's on another world entirely in a body that wasn't his. Or how the dude who likes cutting things in half wakes up in the Grimdark Galaxy.

Tanya in 30k as a Primark, (we're just having a good time here, having fun with the concept don't think too hard about it)

A random hired gun from the hive world of Necromunda gets into a lot of deep shit when he takes a job to try and pay off the bounty on his head. Now he is on a planet full of Wyrd’s. May the Emperor guide him.

As a young Edalyn Clawthorne struggles to handle her new curse, she finds herself under the tutelage of a mysterious, seemingly ancient figure who seems to harbor a deep grudge and possesses bizarre magical abilities. Under him, she would end up becoming witness to an insane series of events that would change to course of her entire life as she discovers a secret war in the Isles.

A certain Viltrumite finds himself in the grimdark galaxy we all know and love. How will his presence change the Milky Way Galaxy of the 40th Millennium? Follow a tale of redemption, glory, betrayal, and blood.

Flesh is weak. I have always known that. Logic metal and steel are strength. They are right in how you must embrace the strength and certainty of steel. I need that more than ever. Because I'm now in a world that is out of my league. I have new enemies that hate me and who I am. I am stuck here in a place that isn't hope. Forever now till whatever end. Sort of self-insert Big AU

What happens when in a Hail Mary to destroy Vilgax in their final battle, that Ben is sent hurtling across space-time throughout the Omniverse; and finds himself not only in a different one entirely...but 30,000 years in the future...Well, strap in as Ben enters into the Great Crusade and battles against the Ruinous Powers. Rated M for Mature Themes and Violence.

He dies in one world and wakes up in another one entirely. Satoru just can't seem to catch a break.

A fluke in the system results in a very lucky, or unlucky, depending on your point of view, guardsman suddenly gaining gamer powers. What will he do? How will the galaxy react? Who knows?

Sometimes, small things can have unforeseen consequences. Like the butterfly causing an hurricane. Or the nail costing a war. Or the snotling messing around where he shouldn't causing the rise of a different kind of hero... "Awigt den, come have a go, ya gits! Waaaaagggghh!"

Some time between TPM and ATC, a hyperdrive malfunction results in the return of a long-lost ship from the ancient Sith Empire, carrying the dreaded Darth Cain, whose reputation in the Old Republic was matched only by his imposter syndrome. Needless to say, this throws a wrench into the plans of Darth Sidious …

In the shadows of a world ravaged by the war, the inhabitants of the Millennium of Only War, learn that there is much of Terra's ancient past best left forgotten...

After ending up in a strange place in an even stranger world, a Psyker and an Eldar are now considering whether it would've been a better decision to kill each other when they first met. Or whether they should've run away when they met the blind girl.

This is a "What If" story that features the primarchs of 'Warhammer 40k' being reborn as girls with quirks in the world of 'Boku no Hero Academia'. Yes, really. Cross-posted at AO3.

The grimdarkness of the far future learns what it means to do the impossible and kick reason to the curb.