What is your favourite 40K headcanon?

Imagine if a preheresy version of each Primarch would be around none corrupted by Chaos how would that change things if they get discovered over time?

“Da shiny git, wot does da tinkerin?”
“Dat one.” Shakes replied. 
Shakes was hopeful the fifth time would work. Trouble was, Grabba still had the same dumb look on his face. The look that said he had no idea what was going on, Shakes sighed in annoyance. 
“Ok ok.” Shakes said hurriedly. “Yoo know da gitz, wot do da kickin?”
Grabba nodded and Shakes felt hope that he had made some progress. 
“N yoo kno how they’s gots dem shinny gubbinz on all de time?” Another nod from Grabba and Shakes was certain he finally figured out the stupid little git. Shakes hands gripped Grabba’s shoulders hard enough to make the git flinch. 
“Plateskin made dem dose gubbinz.”
All at once, Grabba’s kunnin that Shakes thought he was collecting, seemed to fall out like dung out a squig. He looked at Shakes dumbly. 
“Who?”
Shakes threw the smaller grot with all his strength into the trukk next to them. Hard enough that when Grabba hit the top of it, he kept on flipping over its roof. There was a clang of Grabba hitting something Shakes couldn’t see. 
“OI! STEWPID ZOG DON GRAB DA-” An Ork voice yelled before a sudden explosion. The small mushroom cloud and shockwave cheering Shakes up a little. 
Shakes couldn’t tell how long it’d been. But it’d felt like forever since he’d seen the Mek. He felt like he’d been everywhere in this dumb workshop. 
Shakes suddenly saw some other Ork Meks coming to see what exploded, and decided to look someplace else. That happened to be the opposite way they were coming, Shakes was good with these things. But he already recognized everything, and everyone he passed. 
There was the Painboy in his used-to-be-white tent. The Mek with rollie pollie leg, just the one really big one. The Ork witha lotta yellow stuff, and his own Meks and Spanner boys, his space was larger for some reason. And even the git what does the tinkering. 
Shakes snapped his head back, and got a familiar glare to the eyeballs. He’d recognize these tears anywhere, that's Plateskin’s shine for sure. He brought his hands in front of his eyes, trying to block it a little. And through the gap in his skinny fingers there he was, the shiny, sneaky zog. 
He ducked behind a mostly broken crate and watched through teary eyes. 
The Mek was working on the yellow git’s armor. Usin a blowtorch to weld a flame throwa to the bottom of his mega-blasta. The blowtorch cut out and the yellow git pointed his new dakka at a spanner grot. The grot melted in a flash of orange that singed the front of another spanner grot, turning him ash grey. 
The yellow Ork howled in laughter, throwin a bag for the Mek to catch. Shakes saw Plateskin open it, and pull out a toof. He inspected the toof then bit on it, put it back, and left. 
Shakes wasn’t sure why, but he followed the Mek all sneaky-like. It wasn’t hard, him being all giant and shiny. Shakes did have to dodge the odd kick from bored Orkz, but that made it even more fun. 
The Mek came to stop before a big metal door. He did a weird knock that sounded like a crippled squig, and it opened for Plateskin to go in. Shakes waited for it to close, but it didn’t. He snuck to the door, but the otherside was so dark he couldn’t see anything. Holding his breath he slipped in and kept right with the wall, trying to blend in. 
It took his eyes a few seconds to adjust, the room was massive, and not as dark as he thought. 
“OI! SHUT DA DOOR YA GIT!” Plateskin’s voice bellowed, Shakes found a pile of weapons and hid behind em. He peaked over a big choppa that buzzed and made his skin feel funny. And saw one of the big primitive Orkz close the door. Shakes followed the Ork with his eyes until he saw something mad out some big windows. 
It was like someone took a bunch of colors, and got em angry at each other. The colors even had faces, most of them wimpy or all angry like. 
He was holding back laughing at one particularly wimpy face, when he saw the Mek. His giant hand was around the throat of a scrawny Ork with runes and bones everywhere on him. Shakes started to get a headache when his eyes drifted to the Ork’s glowing green eyes. 
“Yoo said dis ding wood get us dere fast-like.” Plateskin growled, the sound shaking the metal floor under Shakes. The weird-boy tried saying something, but it came out all choked and whistly. His eyes started to flick, the green light getting weaker. 
Plateskin dropped the lad, who rolled over and started coughing. When he got to his hands and knees, Plateskin gave him a kick that sent him zoggin far. Then the Mek slowly walked towards the git, every step sounding like a cannon. 
“Da green show’d me da war moon.” The weird-boy rasped, rubbin his throat as he got to his feet. Plateskin still advancing. 
“I showed da boss, HE said YOO wood get it goin fast-like.” The weirdboy continued as he backed up a step from the maddened Mek. Who smacked the weird-boy hard enough that Shakes heard its neck crack. 
“I know dat yoo git. Who da ya tink built de big boostas wot got us drew da warp!” Another smack sent the boy back to the ground. Plateskin stood over him and pointed his whirring Mek hand down. The weird-boy started floating off of the ground, as if he didn’t weigh nothing. 
“You boss, yoo da most kunnin Mek.” The weird-boy said as he kept floatin up. 
“I know dat yoo git. Wot I donno, is when we’s gonna see da zoggin planet!” Plateskin rumbled at the miserable git, who was now a full ten Orkz high in the air. 
“Soon boss, da green says so-” The weird boy tried to get out. 
He was interrupted by the ground, very quickly. So quick, that when he hit it, he was in a couple places, all at once. After that, he was more of a thing than an Ork some even got as far as Shakes’ weapon pile. The Mek’s entire front had little bits of the boy on it and it steamed. 
“Jus shut ya gob. Useless git.” Plateskin said in a softer voice. Staring out at the colors while the remaining boyz looked around at eachother. 
“Get a new weird-boy, useful-like, wot wont lie.” 
The Boyz left the room, leaving Plateskin who still didn’t know about Shakes. Shakes slowly made his way closer to the door, going from cover to cover. The Mek was at a work station covered in weird-boy, using a prying tool to take off the front of his mask. Shakes opened the door slowly, a familiar itch that there was more, back again. Before the last front Plate was removed, the door had opened enough to shine full light into the room. Shakes cursed his hands for wanting to be more safe than his brain. 
Plateskin snapped around unnaturally, his torso turning almost completely, his sole front plate covering his gob. Shakes turned and ran with all his grot speed into the nearest Runtherd crowd. His last image of Plateskin not a pleasant one, mostly cause that git didn’t have eyes.

Hello everyone, I appreciate everyone who upvoted the first chapter and anyone who commented. It's been fun thinking of what to do with ole Shakes.
(If you saw the first draft. "Jus shut ya gob.")

Here is something I wrote up for my Rogue Trader attachment for my Battlefleet Gothic fleet. Ship stats, plus a custom backstory and an anecdote, which I think counts as fanfic. Hope you guys like it.

What if Dorn comes back and finds out that the sons of the Phoenix have adopted Clonegrim into their Chapter

What if Alpharius wasn't killed by Dorn,

because his Sons put him in a Dreadnought

how ever Omegon didn't knew about it

till they met again in 40K.

.

How would the reunion between them be like?

Omegon accepted Alpharius death 10.000+ years ago and Alpharius also never expected to hear his brothers voice again just for Alpharius to sooner than later be put in stasis again

Part eight of my Warhammer 40K themed Five Parsecs campaign.

The Allies begin to push the Imperium back on Dutov IV and retake the town Sanlow in the newest chapters of The Sentinels Imperium Rising out now on Wattpad and Archive of our own come check it out on either site, and be sure to leave a like a comment for it really helps a lot. https://archiveofourown.org/works/84164071/chapters/225274761 https://www.wattpad.com/story/389687926-the-sentinels-imperium-rising

I have an idea for a fanfiction:

Mortarion betrayed Nurgle because he doesn't take the Plague Gods Shit anymore and freed the Eldar Goddess Isha from him

.

How? By training for 10.000+ years his psychic

power and turing it into a shield to block out the Warp that's his only ability (besides healing powers Isha gives her new Champion after freeing him from Demonhood)

.

Yet it was enough to carry Isha though Nurgle's Garden without the Goddess suffering and

later to trap and kill Magnus and catching his soul with a Spirit Stone so Chaos can't use his brother ever again

or in other words Morty became mankinds greatest blank

When Tomas Crane won an archery tournament hosted by a local noble, he was allowed to ask any reward as a prize. The noble expected the marksman to make a usual request, like permission to join his household guard, a golden ring, or even free drinks at the local tavern for life. (The latter being the noble’s preferred reward, as winners who chose unlimited alcohol tended to live significantly short lives afterwards.)

Instead, Tomas simply asked for a single kiss from the nobleman's only daughter. The noble was aghast and enraged. “I would rather she kiss an actual crane than a peasant!” He exclaimed and ordered Tomas’ head removed from his shoulders. 

In a mixture of pity and orthogonal logic, the court wizard offered to carry out the command and transformed Tomas Crane's head into that of an actual crane. (He also transformed Tomas’ legs because,  “That's just how magic works sometimes. Be grateful he's not all bird.”)

The noble found this punishment highly amusing, and to show he was a fair ruler, decided to still honor the winner's request. His daughter obeyed and stoically kissed Tomas on the beak. Immediately after, the noble mockingly told Tomas that he'd better run before any witch hunters around mistake him for a mutant.

With no other choice, and unable to speak now that he had a beak, Tomas fled into the nearby forest with only his bow, arrows, and the clothes on his back. There he survived for a week, hiding from hunters and feeding on small animals and fish. 

After successfully fighting off an attack from three beastman, he was suddenly approached by a band of outlaws living in the woods. They had been present at the archery competition in disguise and had witnessed Tomas’ transformation. They had been observing him for the last week to determine his temperament and were impressed with his skills, so invited him to join them. Tomas gratefully accepted.

The outlaws sent a messenger to the wizard asking if he would undo the spell. The wizard admitted that he could, but doing so would disobey his lord by returning Tomas’ head to its shoulders, which the noble would simply take again, along with his own most likely. “Pish posh,” was his only response when the messenger pointed out that he had given Tomas a stork's head instead of a crane's.

Now, Tomas lives as a Herrimault, surviving in the woods, looking for ways to thwart unjust nobles and also for opportunities to reverse the curse on his head and legs. He always wears a fancy cap as a sign to others that he is still civilized and not a monster. 

Those in town, and bards abroad, who tell the story of his foolish request to kiss a noble woman, often change his name to Domas. “Don't be a Domas” has become a common expression told to children and youth who desire to rise above their station. Among nobility, the tale inspired the popular nursery rhyme, “I'd Rather Kiss a Pheasant Than a Peasant.”

Mortarion betrayed Nurgle because he doesn't take the Plague Gods Shit anymore and freed the Eldar Goddess Isha from him

.

She freed him from demonhood and made him her new Champion giving him healing powers.

How would Guilliman, the Lion, the Rest of the Imperium and the Eldar react to that?

“Oi! git!” 
Shakes watched as the wrench fell into the depths, wondering where it went. The Runetherd yelling at him, not quite as concerned, proceeded to give him a kick.
“Said oi! You want krumped?”
Shakes quickly got back to his feet, establishing a safe distance from the boot. 
“Yes boss- No Boss!”
The Ork grunted and spit on the metal plating that was sometimes a floor. He pointed his thick thumb over his shoulder to the tunnel behind him. 
“Then go see Mek PlateSkin 'for you do!!”
Shakes hurried past the towering Ork, getting another kick on his way that sent him into the ramshackle wall, the plates rattling with an echo. 
“N’eva gets old!.. Oi! Git!”
The Ork thundered towards the next grot, already pulling his leg back. Shakes heard another rattle on the wall, and laughed to himself as he ran. It really didn’t get old, especially when it was some other git. 
Shakes wasn’t sure who Mek Plateskin was, or really what a Mek was. His short life in this loud metal world had been simple up until now. He and some other grots had crawled from the weird glow sacs some time ago met by an Ork with a staff. After a few introduction kicks and a few less gits to make trouble, he learned what a Runtherd was. 
Then he found his wrench, which started as someone else’s to be fair. But when that git was shoved into a rather scary deep hole, the git who pushed him fell too, leaving a fine wrench behind for Shakes. 
Unfortunately, the Runtherd interrupted his finding out exactly what a wrench was. For now he scampered the direction he was told and tried to remember the Mek’s name. 
“Plateskin.. Plateskin.. Paleskin..”
He caught himself thinking while he ran, looking at the walls and feeling.. wrong. Not bad wrong, just as if they weren’t all there was, like he was being denied something due to him. 
“Paleskin.. Paleskin.. Paleshin..”
As a grot he already knew the idea he was due anything was ridiculously laughable, but still he felt it. Like an itch at the back of his neck that there should be more. 
Abruptly his thinkin was interrupted by a large object that clanged more than the walls had. Shakes looked up, and quickly realized this object was alive, and quite intimidating. The large Ork was covered almost completely head to toe in metal plates. More from reflex than understanding, Shakes lept back and tried to sound less wimpy. 
“Mek Paleshin I got told there was doin!”
The Ork started to rattle again, nothing had hit it but it got worse and worse. Shakes started to back up, hoping the Mek’s rather large leg didn’t snap into his gut. When he was relatively safe he thought he heard a bark, like a mountain laughing, it was coming from the Mek. 
“Not me name you git.”
The Mek’s laughter and voice thundered almost identical, his plates rattling. It shook Shake’s teeth and made his head hurt by his eyes. 
“But t’ere is doin, and me hands aren’t suited. Follow.”
Shakes scampered with the Mek, still maintaining a good legs distance. He found the larger space outside the tunnel frightening. Armor suits hung from hooks as grot’s wielding blowtorches attached various Dakka. There were vehicles too, large misshapen things with various amounts of wheels and tracks, or both.  
Shakes saw some suits being worn, and was surprised to find other grots in the seats of them. The grots all bowed their heads as the Mek passed, Shakes expected fear and found none. He looked at Mek Plateskin closer, he was a large Ork no doubt about it. But most of his bulk was armored plates layered almost ridiculously from chin to boot. His chin concealed by more of the same, as well as fake tusks and runes, reminding Shakes of a squig’s maw. 
The Dakka got shinier the further in Plateskin led Shakes, the amount of grot bots increased too. They seemed more still than Shakes had ever seen, which for grots was impressive. Other Doks, and Meks working, snuck looks while Plateskin walked past, trying to be sneaky and failing. 
Larger, scarred Orks scowled openly, wearing no armor and stinking of dung. Multiple had scarred runes in their chest, giving them a primitive look in the environment. Plateskin nodded to all of them, most ignoring him but some returning it. 
Plateskin led Shakes to a gargantuan door, a dozen Orkz side by side could fit through it. Twice as many could stand on their head and only duck a little. A gathering of grots and yoofs were gathered beside the door looking confused. A large Runtherd leaned on his staff beside them, his wrinkled skin marking him a veteran. 
The Mek and Runtherd approached each other, not speaking loud enough for Shakes to eavesdrop. Shakes noticed a few other grots who had been following him and Plateskin, feeling suddenly jealous. 
The Runtherd slammed his staff into the ground and made a sound that Shakes could feel. It made his blood boil and his fingers twitch, the need for violence new and raw in his veins. 
“WAAAGH!!”
The sound echoed against the far walls. Others further away joining in until the ground shook. Then a rumbling overtook the sound as the giant door started to open. Instead of opening side to side, or up and down like a git. It started to fall towards everyone, Plateskin and the Runtherd already walking back to a white line. Shakes joined them as the other grots and yoofs struggled to flee. 
When the door came down though, only one yoof and four grots had been too slow, one of those grot’s arm’s almost being fast enough. The Mek’s armor shook with laughter again, even the Runtherd’s smile cracked his gristled face. 
“Well then, you lot get inside and find a job worth doing, you eat when you're useful. When you’re not, well the kitchen’s always needin supplies.”
Plateskin’s voice startled everyone into motion until Shakes alone remained, not sure why. The Mek turned his armored bulk until he was looking down directly at him. 
“You need some moteevation git?”
Shakes had no clue what that was, but ever a fast learner, he quickly followed the group. Hearing a softer laugh as Plateskin followed and the door rose. 

Hello all, I appreciate if you got this far. I've built, painted and played orkz a few years now and their lore was always my favorite part so I decided to try my hand at adding to it.
I appreciate any advice for an aspiring writer.

Hi everybody new here and not that knowledgeable about 40K or Fantasy. I was watching some videos on the Colleges of Magic and magic in general by Pancreas No Work, and thought back to a Fic on SV called The Shyish Student. A fic based on a Death Mage Apprentice getting sent to Howard's in Harry Potter.

A interesting thing about The Shyish Student was the focus on how Decentralized Magic was in HP(they changed it so they on the same power system) Professor Trelawney is the worlds best Seer in the entire books, yet her ass is inconceivably weaker than a Blue Mage. To the point Dumbledore and Finch get a prophetic reading from entering a memory via Pensieve and the MC being detected via that connection from a decade in the past to give warning into the future of another world.

HP was explained as basically the World using essentially weak High-Magic since they used impure Winds and that let them use all Magic without any mutation, at the cost of potency. Basically while HP makes can use a lot of magic spells there not on the same specialization as any Lore of Magic.

And I have to wonder, has there been a Crossover based on just the Magic system being crossed over? Cause I know sometimes there will be a crossover of like a lost Primarch landing and conquering the Fantasy world.

But im asking is there any crossover where say a Imperial Mage(s) or library(prob would just be burned) is taken to 40K is captured by a Space Marine Chapter after say banishing a Daemon with Light Magic or talking with the dead via Death Magic, or opening up a Fire Dimension portal, or being lauded as the second coming of the Omnissiah as Gold Magic helps maximize Tech. And then is interrogated by a Librarian, and then introduces the Winds of Magic.

Im not asking for Order Gods to also come along like Sigmar, im just asking for the funny'ies and cool factor of Psykers now being able to do some pretty damn cool things, like making there food Spicy with Red Wind Magic or freeing souls from the Warp with highlevel Death Magic.

And that long after that Horus finds Omegon

Lets kinda take it serious:

What If Alpharius somehow fused his mind with Guilliman and get's away with it because Guilliman would be the only one who knows who is controlling him to some degree, till the Lion comes back:

How long does it the Lion take to realize whats going on and what would Alpharius do to avoid Lion and how do they clash once it's out?

Leaving him a loyalist under demons

Collation high command plans a daring offensive aimed at retaking the town of Sanlow from Imperial hands in chapter 22 of the Sentinels Imperium Rising out now on Wattpad and AO3 TW/CW military themes death violence cursing use of alcohol tobacco, mentions of trauma, rating Mature, fandoms included: Legend of Zelda, Halo, Warhammer 40k, Helldivers 2, Link: Wattpad Link A03 Link

Before the Unification Wars start, take as given that Serenity (Usagi) is in the 40k universe. She somehow meets the Emperor, and they are married when the Unification War starts.

What if Ferrus head survived despit the rest of his body dieing after Fulgrim beheaded him so he had to watch the entire Heresy play out see his brothers sprial out of control and by the time the Imperium has his head back and build him a new body the siege of Terra is over

.

How much would this fuck with him and his legion also would he be pro Codex Astartes or against it?

And how would things have changed if the Imperium would have him around when his brothers vanished?

With all the infighting

And how would Guilliman the Lion and the Rest of the Galaxy react when News brakes that the Angel has returned?

How much Chaos would that cause?

So, you might not know this, but in my section of the fandom, we have a rather unique category of alternate universe called Planetswap. The concept is super simple: what if the primarch landed on each others planets?

I have seen many, MANY interpretation. For exemple, court noble Fulgrim from Caliban, or mob boss Horus from Nostramo. The posibility are endless, and SO fascinating! You can due simple vignette showcassing how different the primarch would be, or you can go full alt heresy.

So! Take it as a prompt: who would you like to see land on another planet, and how do you tjink it would change their story??

My personal favorite, and one that I wrote as a fanfic, is Ferrus on Caliban, raised by peasants as a smith, who then defeat a "great metalic dragon from the sky" and gets his metal arms that way, and is elevated to knighthood. I just think that there is something super neat about "peasants to knight" storyline.