I know they’re mostly random but certain things like trukks bikes planes are fairly standard and weapons like common bolter and explosives also.

So how do they make it so standard from across the galaxy? Is it some internal gene code from the Old ones?

Basically are orks "chasing the dragon", from wikipedia:

"Chasing the dragon" is also the elusive pursuit of a high equal to the user's first in the use of a drug, which after acclimation is no longer achievable.[3] Used in this way, "chasing the dragon" can apply to any recreational drug administered by any means.

The Warhammer Grand Narratives, where players can take part in an immerse campaign, tend to get some interesting bits of lore, and more information has been released about this year: https://www.warhammer-community.com/en-gb/articles/0jjz7tqg/grand-narrative-2026-introducing-the-lords-of-war/

We got information on the setting last time: https://www.reddit.com/r/40kLore/comments/1wp1au2/from_warcom_the_grand_narrative_2026_introducing/

So let's see what the latest article says:

At each Grand Narrative event, influential and charismatic characters known as the Lords of War command each of the player factions and use the support of their followers to achieve their goals, be it the salvation of an Imperial world or the summoning of a great daemon.

Let’s find out who our intrepid commanders will be fighting for this year as we head to Ferrum’s Wake.

Kaelen Voss, the Free Captain

Kaelen Voss first knew freedom in the moment he abandoned duty and death amidst the ranks of the Executioners Chapter to follow Huron Blackheart. He embraced the Tyrant of Badab not out of love for the Dark Gods, but because rebellion opened his eyes to a cold, inescapable truth. The Corpse-Emperor’s Imperium gifted him genetically enhanced might, eidetic memory, limitless brilliance, and an artificially long life with which to enjoy it, yet demanded inevitable death amidst eternal war as payment. Its oaths had bound him. In Huron’s revolt, Kaelen believed he had found the freedom to choose his own fate.

He was not alone in that belief. Many Red Corsairs sustained their treachery with simple vices: vengeance, ambition, blood, plunder, survival. Kaelen chose philosophy. He spoke of the lie of service, the corruption of thrones, the slow murder of duty, and the cowardice of men who named obedience virtue because they feared the void beyond it. Amidst an unapologetically traitorous band, Kaelen saw himself as a bastion of nobility.

Then Huron’s rebellion became a kingdom. It acquired rites, hierarchies, sorcerers, daemonic bargains, whispered devotions, and all the old shapes of servitude wearing the new, vibrant colours of the Maelstrom. Kaelen watched warriors who had spat on the Imperial Creed bow their heads to warp-born things. He saw free captains become courtiers. He saw rebellion harden into another chain.

So he rebelled again.

Renaming his strike cruiser Unbound Horizon, with a core of his oldest battle-brothers in tow, Kaelen abandoned service to Huron and escaped the Maelstrom. Drift, design, or damnation took him to the world of Ferrum’s Wake, where philosophy became proselytisation. Naming himself liberator, he shattered command spires, cut noospheric networks, armed underhive districts, and broadcast a promise through every vox-channel on the planet: no gods, no masters, no chains.

The people of Ferrum’s Wake believed him, and expressed that belief through the song of civil war.

In the aftermath of its liberation, billions sing Kaelen’s name as that of a conqueror. They offer him tithe and worship in equal measure, begging him to ascend to mastery of their world. At every turn, the Free Captain denies their offerings. His only demand is absolute devotion to liberty, no matter the cost or chaos it incurs.

As the Maelstrom swells bright in the void, Kaelen Voss’ fervent commitment to freedom only strengthens. He prepares the world, its fleets, and all those who share his cause for the inevitable vengeance to come. He will not kneel to the Emperor. He will not bend to Huron. He will not bargain with the gods. Upon Ferrum’s Wake, the Free Captain will make his stand.

The Warrant

The thing called The Warrant sits upon a brazen throne on a benighted warship. Commanding a fleet of heretics, renegades, oath-breakers, and blood-mad supplicants, it approaches Ferrum’s Wake with undeniable purpose.

The Warrant approaches Ferrum’s Wake for the head of Kaelen Voss.

It claims to be Huron Blackheart’s punishment wrought in adamantine and iron-hard muscle: an executioner and warlord whose existence is less a state of being, more a passage of judgment. Among the Red Corsairs, deserters whisper of it in sealed compartments and dying vox-bursts. They say no writ is needed where The Warrant walks. None have ever seen the Tyrant of Badab acknowledge the creature, much less command it, but who would dare doubt its provenance beneath the shadow of an axe?

Its armour bears old Corsair markings beneath layers of ritual scoring, brass kill-runes, and tally marks cut too deep to be mere decoration. Its helm is smooth where a face should declare identity. Whether the Warrant was once a failed Red Corsairs aspirant, some daemon-thing given shape by the Maelstrom, an assassin-priest of the Blood God, or some composite nightmare assembled from all three is a matter for those with the luck to survive their curiosity. Its voice emerges through multiple channels at once, sometimes as a judicial monotone, sometimes as a drowning man’s laugh, sometimes as what sounds like Huron’s own displeasure rendered in red static.

Its purpose is larger than murder. Kaelen’s death must instruct. His followers must understand that freedom is fiction. The world he stole must either be dragged into the Maelstrom’s orbit of terror or ruined so completely that no future captain mistakes desertion for destiny. And so the Warrant comes not as mere killer, but as a warlord, garbed in the raiment of command and accompanied by a host of the Maelstrom. Daemons, Chaos Space Marines, and red-handed zealots march in its wake, slaved to its whim or eager for the spoils of a fallen Imperial world.

For all its dread authority, there is a brazen hunger in the Warrant’s actions. It gathers skulls not merely for the gods, but as petitions. It takes heads as evidence. Every oathbreaker slain, every deserter butchered is offered upwards: to the Blood God, to the Maelstrom, to Huron Blackheart, or perhaps only to the empty place where their approval should be. Some suspect that this fanatical entity has neither met nor been sanctioned by the Tyrant at all, though they are careful never to let such whispers reach the Warrant or its followers. Such distinctions matter little to its victims. Whether servant, pretender, or masterless revenant, the Warrant lives to enforce one irresistible truth: no oath to Huron Blackheart is ever broken cleanly. 

Commander Orestes Morn

Orestes Morn has never needed to raise his voice in prayer. He believes that the God-Emperor hears discipline.

That, at least, is what those who serve under him assert. Morn is not theatrical in his devotion. He does not weep before icons, thunder scripture from balconies, or decorate every order with pious excess. His faith is colder, harder, and more dangerous: an absolute internal architecture by which the universe remains bearable. The God-Emperor endures. Humanity obeys. Treachery is punished. Sacrifice has meaning. The dead are accounted for. The chain of command is as unyielding as auramite.

To see Ferrum’s Wake as it now stands is, for Morn, to witness heresy of the highest order. Anarchy, corruption, and chaos, garbed in the false promise of freedom.

He approaches at the head of an Imperial reclamation force bearing soldiers, ships, priests, Astropathic relays, Adeptus Mechanicus envoys, the bureaucratic machinery of restored allegiance, and the essential simplicity of Orders of Execution. He comes as the return of law. He comes as the hand that steadies the drowning. 

Morn’s own faith has endured because it has never truly been asked to bend. His certainty is immense. The God-Emperor’s will must be coherent. Obedience must matter. Loyalty must be answered. Ferrum’s Wake threatens the certainty of the galaxy. Its people, if they can be called such, have committed the gravest of sins. But this world of iron can be returned to the Emperor’s grace. Across the hundreds of ships of his reclamation fleet, more than a million devout citizens of the Imperium wait at rest. They wait in prayer. 

They stand ready to replace those who traded the God-Emperor’s love for the lie of freedom.

Mara Venn, Reluctant Saint

Mara Venn was born beneath Ferrum’s Wake in a district where children learned three rules before numbers: do not trust clean water, do not sleep near vents that hum, and do not speak loudly when the machines stop.

She was not raised to be a soldier or a saint. The God-Emperor had other plans.

Before Kaelen Voss came, Mara’s people belonged to quotas, guild overseers, ration clerks, enforcer sweeps, sump debt, and the slow arithmetic of underhive survival. With the arrival of the Free Captain, they belonged to whoever could keep the oxygen shrines running and the guns loaded. Liberation changed the names on the boots. It did not keep them off anyone’s throat for long.

Mara became important by accident, which is the only way she would have tolerated it. She knew ductways others had forgotten. She could bargain with gangers, lie to warlords, steal from armouries, restart dead lumen grids, and talk frightened people into moving when staying still felt safer. She made bad deals and better escapes. She lost friends. She made bombs out of devotional fixtures. She laughed at the wrong moments and cried where no one could see.

Then the impossible began accumulating around her.

A hab-stack collapsed seconds after she pulled a refugee column through the wrong door. A corrupted servitor pack froze at the sound of a hymn she did not remember learning. A sniper round struck the aquila charm at her throat and left only a burn.

Crude graffiti of her haloed visage began terrorising her from the walls of the underhive.

Some call her a living saint of the God-Emperor. Mara herself says saints do not steal medicine at knifepoint or shoot men in the back while they reload. Yet still they come: loyal soldiers cut off from command, broken priests, repentant rebels, and every desperate soul still praying the God-Emperor will send angels to save them.

Mara is not trying to save Ferrum’s Wake. Mara knows its doom was brought by just such an angel.

But even an unwelcome burden can spark a glimmer of heroism. Mara does want to save her people. Deep in her heart, she shares their faint hope in the God-Emperor’s salvation. If only there weren’t quite so many to save.

A very interesting line up, imo.

We have a rebel Space Marine, Kaelen Voss,* who joined the Red Corsairs, only to rebel again. Deeming himself a philosopher, he preaches total freedom (even if reality can never live up to this...) Definitely interested to see how his story develops. Hopefully he doesn't just succumb to Chaos in a very cliched way.

We have the possibly daemonic, and at the very least weird and mysterious, being, The Warrant, sent to hunt down Voss for his betrayal.

We have a harsh true believer in the Imperial Faith with Orestes Morn.

And a reluctant hero, who denies she is either a hero or a saint.

There is the potential here for some interesting dynamics. Let's hope they are used to their potential.

It's nice to see the Maelstrom continue to get developed, too - and in a bit of a different manner.

As always, any thoughts on this? And details worth focusing on, or any interesting references I missed?

*(Presumably no relation to our favourite chunky Imperial Fist gymbro Maximmion Voss, aside from both being son of Dorn).

[Sorry this is a longer one. Didn’t wanna make multiple posts asking the same question ]

Okay so where does the Imperium draws the line between ordinary equipment, master crafted wargear, artificer equipment, and actual relics.

I understand that certain weapons and suits of armour are considered priceless because of their craftsmanship, age, history, or the individuals who once carried them. But how much of that is technological superiority, and how much is religious or cultural significance?

For example, could a newly manufactured suit of power armour be considered artificer armour simply because an exceptionally talented Techmarine spent years perfecting it?

▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰

Does something have to be centuries or millennia old before it’s considered a relic, or could a relatively new weapon earn that status through some extraordinary accomplishment?
also curious about a few other aspects of this.

▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰

Human equipment compared to Astartes equipment

How different are the standards for ordinary humans, Space Marines, and other Imperial organisations?

▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰

Could a particularly wealthy Rogue Trader, Inquisitor, noble, or Imperial Guard commander possess artificer quality weapons and armour comparable to what a Space Marine captain might carry?

▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰

Are there examples of human sized relic weapons or armour that are technologically superior to their Astartes equivalents, even if they aren’t necessarily usable by a Space Marine?

▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰

And who actually produces these things? Are they exclusively made by exceptionally skilled Tech priests and Techmarines, or can independent human craftsmen still create equipment of that quality?

▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰

What about the Adeptus Custodes?

Considering that Custodian equipment is already individually crafted to an incredibly high standard, would practically everything in their armouries qualify as artificer grade by Astartes standards?

▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰

Do they distinguish between ordinary equipment and especially treasured relics of their own?

▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰

Do they possess weapons or armour that are considered exceptional even among the Custodes?

▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰

also curious whether any of their equipment has become completely irreplaceable, despite the resources and technological knowledge available to them.

▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰

Do any Space Marine Chapters dislike relics or artificer equipment?

We know some Chapters place enormous importance on their ancient equipment, but are there any that take the opposite approach?

Maybe a Chapter that sees excessive decoration or the preservation of ancient wargear as unnecessary vanity?

(I think the raptors fall under that for armor but I don’t know for relic weapons )

Or one that prioritises newer, more practical equipment over weapons carried by long dead heroes?

▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰

Are there Chapters that actively modify or improve their relics rather than preserve them in their original condition?

And what happens when a relic is destroyed? If the Chapter recovers the fragments and rebuilds it almost entirely, is it still considered the same relic? At what point does it become a completely different weapon?

▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰

Vehicles, Dreadnoughts, and ships

This is another area where I’m particularly interested in examples.

I know ancient designs like the Sicaran and Fellblade can survive into the modern setting as extremely valuable relic vehicles.

But what makes a vehicle a relic beyond its age or rarity?

Could an ordinary Predator, Leman Russ, or Land Raider become a revered relic after a couple decades service? From just getting old ?

▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰

Are there any particularly interesting one of a kind vehicles, Dreadnought chassis, or warships that have been extensively modified over thousands of years?

▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰

Finally, what are some of the most interesting or unusual Imperial relics you’ve encountered in the lore?

They don’t necessarily have to be powerful. I’m equally interested in strange experimental weapons, customised armour, vehicles, lost tech, and objects considered priceless simply because of who once owned them.

especially in examples outside the usual famous Chapter Master weapons.

Pretty much where does exceptional craftsmanship end and a genuine relic begin? Is there any consistent distinction, or does it depend entirely on the organisation preserving it?
Book excerpts and obscure lore examples are absolutely welcome.

Since we know that there is always an explanation on why the Emperor can appear different to different people (Psyker disguise and stuff)...

Is it ever happened that there was something in the environment that force him to give a clear data?

Like "he was in a small bunker" so he wasn't 4 meters

Or he shared a tools, a chair with a regular human

Or he was with a bunch of Sisters of Silence.

Some situations where you can't apply the "A wizard did it" answer.

I used to causally play the tabletop game as a kid back in the 90s and I wasn’t even aware of the extended universe that it was all set in. Fast forward 30 years and I’ve found myself stumbling down a never ending rabbit hole of lore since I played Space Marine 2 and consequently read 35+ Black Library books.

A lot of the time many discussions in here are cut short by someone saying X or Y will or won’t happy because Warhammer want to sell plastic figures, but do you think there may ever be a point in the future where the company prioritises pushing the lore forward in order to sell more IP through video games, TV shows or movies instead of keeping things relatively stagnant because it suits the table top game?

A cursory glance at the company’s finances suggests that only like 10% of revenue comes from selling IP (although that doesn’t include black library books and audiobooks), but I suspect that could jump pretty quickly with more and more games on the way, plus the potential for TV and films.

Anyway; hope this doesn’t come across as me trying to antagonise avid table top players. I just wanted to get an impression from people that have followed Warhammer pretty closely for a number of decades.

...as the Omnissiah?

I know he had this big "i am not a God", but the whole story about how he convinced the Mechanicum to ally with his Imperium, and how the red priests of Mars decided he was the Omnissiah reeks of conman showmanship.

Like, did he asked the Terra/Mars treaty to include the fact that the Mechanicum accepted Him as the incarnation of the Machine God in the Materium?

Did he try to deny the status of the Omnissiah? How much of a hippocrite is he?

A while ago I heard that some inquisitor shot Ahriman directly to his heart with a fancy pistol and since that moment he has to be constantly stopping the bullet with his psychic powers so the bullet doesnt destroy his hearts, so my question does this mean that if Ahriman gets close to a strong enough pariah he will just die instantly?

Allegedly some of the World Bearers that became Gal Vorbek were Alpha Legionaires who then escaped, so wouldnt the Alpha Legion been aware of the World Bearer shenigans prior to the novel Legion, or is that just a plot hole thats come about

In the past I really enjoyed following the adventures of Marduk especially when he had Slaanesh literally coming through him. That was a wild read!

Is there some good books or lore sources around other Dark Apostles and the Dark Council?

I really like when it talks about like mysticism type stuff, esoteric rituals, again when Marduk was doing all the various things before they did the ritual killing and resurrection on him.

That kind of stuff is peak for me.

Hey everyone

For the last few months a dedicated team of Lexicanum, Total War Wiki and other editors have been hard at work on a new wiki to cover both 40k lore and media, along with video games like Total War 40k, Dawn of War IV, etc.

If you're not satisfied with the existing Lexicanum and Fandom wikis, we'd love to have you! We've got a much more modern, stable and easy to use website, along with open comments for each article among many other changes. You can have a look at the wiki at https://warhammer40k.wiki.gg/ or https://40k.wiki/

If you want to know more about the project, feel free to check our announcement or a more in-depth explanation about forking from the Lex.

We'd love to have your feedback and for you to join us on this adventure! If you see something you'd like changed but aren't confident to edit it yourself you can leave a comment on each article page or reach us on Discord!

The 40k Wiki team

PS I asked the modteam before posting this, but have had no answer. I know about rule 2 but feel like this is pertinent to the sub, but if not feel free to tell me or send the Minotaurs after me

Hey everyone, I’ve been working on an admech army recently and I want some inspiration for making cool custom units. I’m a little confused by how much the priests are able to modify and make their own machines, so I want some ideas of what’s possible as well. Some examples off the top of my head:

- The giant mechanical worm featured in the eisenhorn series

-Early skitarii being feral cyborg barbarians wielding hellguns

- the explorator, featured in necromunda

-Various tech priests and freaky servitors

Literally anything helps, though I’d prefer to stay away from dark mech, just cause they’re kinda “do-anything”. Thank you!

Say a child is born to a Craftworld Eldar mother but she’s isolated and has no way to get the baby a soulstone, or an adult Eldar’s stone breaks because of some disaster. Does that Eldar begin to feel Slaanesh nibbling on their soul? Does inflicting pain on others relieve their suffering?

Did the chaos god in history to ever fight each other face to face or they just keep sending minion to each other

We know that “an emperor in the warp” exists in some form, whether it’s the star child, a faith driven gestalt being, whatever he was in the dark imperium trilogy when he helped g-man, etc.

In the warp, all moments of time converge, it’s a state and place of infinite temporal possibility (per Orikan). Because of this Samus can come back and haunt Lokan in Horus Rising before he is created in the materium, and Euphrate Keeler can channel the emperor‘s faith based powers even before the heresy begins (maybe, unless someone has a better explanation lol).

This makes me wonder how much Big E could sense his own downfall, whether he knew of his “other“ self in the warp prior to its own creation within the materium’s own linear timeline.

My personal opinion is it’s just another lore plot hole that’s intentionally vague due to the stated mechanics of how the universe works. The emperor‘s faith powers and his warp self aren’t really supposed to make sense and kept deliberately vague for good reason, but I am wondering what this subs opinion is and if there’s any tidbits about it anywhere.

So like a demon shoots a fireball. Thats just mental energy? Or is there seperate magic in universe as well?

Is everything just mortal and warp entity emotion power or is there seperate non warp related magic?

The statistics say its only twice the range of a normal Meltagun, which i know is for balancing, but have we had any idea of how powerful it actually is in universe?

I'd imagine that thing would be a beam of death lol

The upscailing of the Melta design to such a massive size would no doubt give this thing some terrifying range and power.

It's obvious that orks like having fun for themselves. But do they enjoy mutual fun? Examples of orks being sociable and genuinely enjoying each other's company?

I think the easiest way to explain this is talking about followers of Nurgle. When followers of Nurgle are together, it makes sense that they wouldn't be affected by each other. They are all bloated, infested with various diseases, and basically half dead. When non-chaos people encounter them, they either get infected with supernatural diseases, die, turn into a zombie, or beg for relief from Nurgle. That also makes sense.

But how are other chaos followers not affected by these same afflictions as non-chaos aligned people? The most I've heard of it affecting other chaos followers is them finding them stinky and uncomfortable to be around.

Another example are followers of slaanesh who can be so alluring that it can drive normal people crazy. But other chaos followers just find them distracting or annoying. So generally speaking, how can other chaos followers not be affected by stuff that affected everyone else?

I'm writing a little personal novel and was wondering if Cawl's work on the Primaris program shifted the age ceiling for recruitment?

Imperial guard is quite reasonable for WH40k: range warfare, combined arms, artillery prevalence and so on.

But it baffles me: if bayonet is a last resort tool for them, why they have such a variety of them, that are definitely more combat adjusted than as a utility multi-purpose like our bayonet, and train killing with it so extensively, unlike our forces ? Vitrians had theirs designed as if spikes to act as spearheads while mounted on the lasgun, which in my mind would not be as effective in opening cans or cutting ropes, tanith had rather long, sliver blades and a whole fighting style, Krieg take pride in their bayonet training and combat, wielding also other weapons of melee combat, catachans have whole collection of blades (i get they are tough but a shell pr energy bolt to the chest usually quells anyone's fighting spirit). Additionally no imperial commander, even that callous as Hechtor Dravere or Chenkov, have any notion of charging in face of dug in enemy with bayonets (there was one Jantine but he was likely schizophrenic or simply mad) when shooting is preferred option.

I'm thinking one of these scenarios:

• it feels natural to them to do something entirely un-orky like make a farm or paint pictures all day long

• they can build something that they normally can't even build

I imagine such an ork would just get pummeled by the others though.

So I was thinking about this since my last post. Many of the Legions were infamously known for their heavy-handed method of compliance. The World Eaters, Dark Angels, and Night Lords coming to mind.

But what Legions were the most light-handed? Going out of their way to minimize civilian casualties and infrastructure damage? Assuming it isn't an extermination campaign.

I'd imagine it would be the Raven Guard who would take out key leaders before moving in. Or the Alpha Legion orchestrating schemes upon schemes that would see an easy compliance. What are your opinions?

I'm not sure if it's been mentioned but I have been seeing more questions about Nihilus. I'm currently working my way through Rogue Trader and it's fantastic to see how an Imperial Organization is dealing with the effects of the whole galaxy being ripped in two. Definitely recommend!

Okay so in terms of newer Imperial technology how much has fallen into the hands of Chaos, and whether there are any weapons or vehicles that Chaos Space Marines simply can’t use.

From what I understand, only a few decades have passed since the introduction of Primaris Marines, although the timeline is a little messy. I doubt many, if any, entirely Primaris Chapters have turned traitor in that time, but surely some have been wiped out after biting off more than they could chew. Since even with training sims the real action can be a while different ball game.

So have any Chaos warbands actually managed to loot and use Primaris exclusive equipment?

I’m talking about things like bolt rifles, plasma incinerators, Mk X power armour, or even larger equipment like Repulsors, Gladiators, and Redemptor Dreadnoughts.

I’d imagine some of this equipment has been captured after battles, especially considering how many worlds and Imperial forces have fallen since the Great Rift opened.

Have we actually seen Chaos Marines using any of it in the lore? Or is there something preventing them from doing so, whether that’s not being able to wielded by fists born, maintenance requirements, ammunition shortages, or simply not having the knowledge to operate it?

And would the Dark Mechanicum be capable of reverse engineering these newer designs and producing their own corrupted versions?

I’m also curious about the bigger picture. Is there any Imperial technology that Chaos forces have captured but genuinely cannot operate or reproduce, even with the assistance of the Dark Mechanicum?

I’m mainly asking about lore rather than tabletop restrictions. I’d love to hear any examples from novels or codexes of Chaos forces using captured modern Imperial equipment, especially anything introduced with the Primaris range.