Alternate Heresy

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The Horus Heresy is one of the biggest events in the Warhammer 40,000 story. Naturally, people like dreaming up alternate scenarios. Page still being expanded.

In-Universe Alternate Heresy

In Lorgar's visions with Ingerthal the daemon he gets shown alternate futures in which he stabs Sanguinius and then gets executed by Horus "for his sins", and another one in which he gets taken out by Curze and Russ working together "for defying the Anathema." He also gets instructed by Kairos Fateweaver to avoid at any costs a duel to the death with Corax lest he get his shit pushed in. These are explained as "possible futures" which did not come to pass; in each case it would seem that Lorgar is still the First Heretic, but the arrangement of loyal primarchs is different.

The Dornian Heresy

The Dornian Heresy was the 40K web forum Bolter & Chainsword's project to switch the allegiances of the various Primarchs during the Heresy, and explore what would have happened to the Legions under their command if they had fallen or not.

Unlike the following scenarios, which were largely thought exercises in random threads on /tg/, this was a full project, with accompanying Index Astartes articles and quite a bit of fluff, which can still be found quite easily.

Essentially, during the incident on Davin, Magnus the Red actually arrives to visit and exorcise the infection on Horus instead of relying on Erebus' rituals. While successful at both saving the warmaster's life and preventing him from becoming corrupted, it did leave him out of commission. Following their temper tantrum, the Chaos Gods decided that the next best choice was Rogal Dorn, who had been going on overdrive with his pet pain glove.

In the end, the Space Wolves fell to Khorne, the Blood Angels fell to Nurgle in an event almost identical to the canon Death Guard. Surprising, given the actual novels imply that they would've fallen to Khorne, if anyone (actually makes a lot more sense; SW hates psykers like Khorne, berserkers are a very Norse theme, and Baal is an irradiated waste where blood diseases -like the BAs end up with- make some sense) the White Scars fell to Slaanesh, the Raven Guard fell to Tzeentch, the Salamanders fell to Malal, and Rogal Dorn himself was the arch-traitor, with his Imperial Fists supporting Chaos Undivided (renaming themselves the Black Legion after the failure of the Heresy). The Ultramarines did not fall to Chaos, but instead became Reasonable Marines; they seceded from the Imperium alongside much of the Ultima Segmentum, and now exemplify progress while fighting off the Tau. The Iron Hands seem to have gotten mixed up with the Necrons, while the Fallen Angels won out over the loyalist Dark Angels.

On the Imperial side, the Word Bearers became the Ecclesiarchy (with no Kor Phaeron to twist it all to heresy - he proved incompatible with the gene-implants), the Iron Warriors remained siege masters, the Sons of Horus became the crusading Black Templars (after almost identically disowning Horus' foolishness which led to the Emperor being mortally wounded), the Emperor's Children remained exemplary perfectionists (except for Fabius Bile, but he's dead now... maybe), the Thousand Sons became blind psychic warriors (see: Grey Knights), the Death Guard became the core of the Inquisition, the World Eaters became serious instead of angry, the Night Lords remained loyal Scary Marines, and the Alpha Legion were just as sneaky and just as anti-Ultramarine, but still loyal (apparently the Cabal wasn't that convincing in the Dornian Heresy).

How the Space Marines are organized is also flipped, as the legions falling to Chaos occurred because of them being separated by all sorts of circumstances, so Abaddon (who takes over as leader of the Imperium after the Emperor's battle with Dorn) organized the legions into a few giant armies (by Space Marine standards).

It's pretty awesome...except that, as most alternate heresies are wont to, it all amounts to some absurd amounts of marine-wank. Perhaps the most particular is the Reign of Blood, where the Sisters of Battle never existed, because they were wiped out by the Word Bearers when they were still the Brides of the Emperor, and Goge Vandire (who was now the new Chapter Master following Lorgar becoming a martyr post-heresy) wasn't overthrown by some simple preacher, but by a novice marine named Sebastian Thor. Meanwhile, all of the xenos factions are left to mere footnotes or mentions (just as Games Workshop intended) and the impact this has had on the Imperium at large is left to interpretation.

The Imperial Heresy

In the Imperial Heresy, the God-Emperor of Mankind decided "if you can't beat 'em, join 'em" and sided with the Gods of Chaos.

The Eldar Gambit

In the Eldar Gambit, Eldrad meets the Emprah the day before the final assault on the Vengeful Spirit, offering assistance in exchange for closer Eldar - Human cooperation later.

The basis of the pact is that instead of taking the mortal blow that Horus throws at him on accident, he does it deliberately, and uses the energy of his own death to attack the Chaos Gods directly, specifically Slaanesh. He steals the stomach of Slaanesh and incorporates it into himself, so now all Eldar souls will go directly to him when they die, keeping them safe from the depredations of Chaos.

The thread was mostly speculation on how a united Imperium of Man and Eldar Empire would work together... and it's actually pretty awesome. Ollanius Pius being revered by guardsmen as an Avatar of Khaine and killing Horus right after Horus defeated the Emperor (albeit he was weakened from fighting the Emperor), Space Marines with soulstones to keep the forces of Chaos away from loyal marines, a fractured Adeptus Mechanicus (with four factions - Traitor, Loyal, Machine God fanatics and Fundamentalist (doesn't use Eldar tech that is now more freely available)), and more.

The Hektor Heresy, AKA the /tg/ Heresy

/tg/ Creates an Alternate Universe of 40K Astartes legions and discusses how the heresy would play out between them. Since then it has spiralled into a near-total overhaul of the 40K universe as a whole. Although there are variations in quality and completion, the project feature original art and write-ups for the new primarchs and their legions, original regiments of the Imperial Army, a new take on the Squat, and other warhammerania. For those interested in the origins of the project: Archived /tg/ threads can be found at http://archive.moe/tg/thread/34414189/ (Initial Legion creation) and http://suptg.thisisnotatrueending.com/archive/34432982/ (Alternate Heresy thread)

Imperium Asunder, AKA the /tg/ Heresy II: Electric Boogaloo

Yet another alternate Heresy with all-new Primarchs, only one where the Emperor is outright killed and Chaos consumes half the Galaxy, while the Loyalists fracture into a number of warring empires on the Eastern Fringe.

Warmasters Triumvirate, AKA the /tg/ Heresy III: Reloaded

A third alternate Heresy with new Primarchs. After the Emperor is incapacitated relatively early on, he leaves three of his sons in charge of the Great Crusade, the Warmasters Triumvirate. When more power is given to the Council of Terra and regular humans, tensions begin to rise. This one has 21 Space Marine legions, pitted against each other in a three way Brotherwar between the Imperial Loyalists, Chaos Traitors and Confederated Seperatists.

The Roboutian Heresy

The true heresy has begun: Papa Smurf takes the place of Horus and fucks over the Imperium. Much shedding of blood, sweat and tears ensues, with generous helpings of manliness on the side. It's pretty awesome.

Inspired by the above mentioned Dornian Heresy, circumstances happen that lead to the Primarchs who turned traitor in canon to stay loyal and the loyalists to turn traitor. For this Heresy's loyalists this ranges from having a small point that causes a major divergent in their lives, like Konrad and Angron, to having completely different lives like Lorgar. The Traitors all at a certain point have a moment that led them towards Chaos, some better done than others, even the fic's writer admits El'Jonhson's could have been done better, but the rest bring much tragedy and sorrow, except Vulkan who is this timeline's Nagash. Even then, Vulkan's moment of divergence is absolutely horrifying and the only reason it isn't sad is because how awful Vulkan is in this timeline. However, even Vulkan's horrors pale in comparison to that of Corvus Corax.

Of the traitors, Vulkan was raised- then killed by, a female fire drake, causing him to realize his immortality early on and gain a god-complex. This wish came true when he, hating the 4 chaos gods but believing SO HARD in his own superiority, actually turned himself into the chaos god of greed and pride! I.e., a giant chaos version of Smaug. Rogal Dorn fell to Khorne due to a massive ork fleet almost destroying the Inquit System and destroying the Phalanx, leading to him never using his magic pain glove to temper his anger. Lion El'Jonson spent too long in the warp-tainted wilds of Caliban and became corrupted by Tzeentch. Sanguinius grew up with an even greater fear of mutants and deviation, causing enough doubts and fear that, when Slaanesh came knocking, he gave himself and his legion up willingly. They then turned into full-on horny space-vampires who get off on drinking blood. For being the archtraitor, Rowboat himself had a pretty lazy bog-standard "hometown and parents were destroyed and became more brutal because of it" backstory. Jaghatai grew up with chaos worshippers and Russ lost his pet wolves, Geri and Freki, while executing the Lost legions. Ferrus became an utter social darwinist and got infected by Nurgle when he tried to blow up a daemon world. Then there's Corvus Corax, who was in the care of the mad scientists of Kiavahr and, seeing his immense scientific potential, proceeded to slice him up, poison him, disembowl him, tear off and reattach his limbs, and countless other horrific tortures in the name of 'science.' It only gets worse, as he himself became a mad scientist, created horrific astartes clones called Spawn Marines, and became an avatar of a previously unknown chaos god of emptiness and the void (Malal?)

For the loyalists, Konrad had a loving mother who helped develop his moral compass into less of a Punisher and more like Batman. Magnus fought a titanic psychneuein on Prospero, learning to use his muscles instead of his powers when the creature was immune. When Tzeentch offered to save his sons from the Flesh Change, Magnus said no and basically cured it himself. Now much more cautious, he sent Ahriman to help Horus during the crusade, allowing them to heal Horus and thus the Warmaster never fell. Peturabo, as new Preatorian of Terra, performed a far better job than Dorn did in the Horus Heresy, making a stellar defense for Terra and even constructing huge rings of planetary fortresses around the Eye of Terror and Ruinstorm to keep chaos caged up after the Heresy, called the Iron Cages. By killing his Witchlord foster father, Mortarion learned how to get shit done as he took up the role as Big E's executioner, killing/banishing both Jaghatai and Vulkan singlehandedly before his demise in two separate moments of Awesome. Lorgar and Angron had loving parents and used their psychic charisma to lead revolts against their cruel planetary governments, with Angron never getting the Butcher's Nails, and Lorgar slaying Kor Phaeron when he saw the horrors the cults of chaos were capable of. Fulgrim having a few librarians with him meant he never took up the daemon sword of Slaanesh... buuuut the Eldar didn't know that, so Eldrad convinced the Dark Eldar to kidnap him and subjected him to decades of disgustingly extreme torture so Slaanesh couldn't have him, on the pretense of a faulty prophecy. Thanks Eldrad! Finally, Alpharius Omegon had their pragmatic and ruthless ways tempered by Konrad, so they turned out to be one of the single most valuable chapters of astartes the Imperium has. The Alpha Legion also became buddies with the Rogue Traders, which is pretty cool.

Can be read here (also contains sidestories and word of god).

Can also be read here (see threadmarks) for reactions from the primarchs and the Emperor himself.

Warhammer High

Technically an Alternate Heresy, as in there was no Heresy at all and the Emperor decided Malcador's ideas were not stupid after all and made 19 female Primarch children to give the Primarchs some responsibility Post-Great Crusade, something to live for, a chance for family, and because he really wanted Grandkids.

Imperium Ascendant

The Most Fuck-Ass Awesome Timeline: The Legion of the Damned are sent back in time by the Throne-Emperor to stop the scattering of the Primarchs by Argel Tal. After they succeed, the Emperor of the past looks upon the future that is the galaxy of 40K and vows to ensure that such a nightmare will not come to pass as the Ascendant Imperium strikes out against the darkness. Currently at Thirty-Eight Chapters with no sign of stopping. In short, The Emperor learns where the Canon timeline will lead, and decides to take corrective measures.

Brotherhood of the Lost

The Icarion Insurrection = First AU created by Brotherhood of the Lost, started on Bolter & Chainsword, with the starting question being: "What if the canon legions were replaced by lost legion projects?" A three-way war between the loyalists, insurrectionists, and the smaller suzerainty, lasting for decades. Sub-forum can be found here, and a wiki here. This AU has since been discontinued and the writers split into the following two new AU's; The Five Ruins and The Broken Throne

The Five Ruins

The newest project from the Brotherhood of the Lost combining old talent and legions with new blood and ideals, the Five Ruins project is set in an ever-escalating conflict caused by the disappearance of the Emperor on His way to Ullanor. Finding their father and guiding star gone, the remnants of the Imperium are left to pick up the pieces as the galaxy trembles in anticipation of the horrors to come.

Sub-forum can be found here, and a wiki here.

The Broken Throne

Founded after a certain difference of opinion in the Brotherhood of the Lost project led to the demise of the Icarion Insurrection and a bunch of the creators walked out and took their Legions with them. Warmaster Yucahu of the Void Eagles has been assassinated, the Emperor has disappeared amidst chaos at the heart of the Palace, and the new Lord Regent Kozja of the Warbringers must to pick up the pieces whilst faced with an increasingly violent opposition from other Primarchs. Meanwhile, Ixiplatlan of the Eagle Warriors pulls strings from behind the scenes to incite civil war and spread the reach of the Primordial Annhilator.

Once everybody's figured out which side of this Machiavellian mess they're actually on, the Loyalists must launch an attempt to retake Terra and disrupt Ixipatian's ritual. In the aftermath of the climactic battle warp storms ravage the galaxy, and the Imperium fragments into hundreds of factions striving for their survival.

https://w40k-broken-throne.fandom.com/wiki/A_Broken_Throne_Wiki

http://www.bolterandchainsword.com/forum/290-a-broken-throne/

Nobledark Imperium

Probably one of the more divergent Alternate Heresies out there. Like Warhammer High technically an Alternate Heresy despite there not being a heresy at all. Nobledark is as much a retelling of the 40k universe with intentional twists as it is a straight alternate timeline, sort of like Hektor Heresy or Imperium Asunder, though in general all parties receive a buff to reason and common sense, as you would expect from a universe that is nobledark as opposed to grimdark.

Instead of earning the ever-lasting hatred of the Chaos gods by doing {{REDACTED}} that led to the creation of the primarchs (who in this timeline are the Emperor's greatest, though otherwise similar to canon in name and deed), in this timeline the Emperor plotted with Eldrad and agreed to a last alliance of elves and men a team-up between the nascent Imperium and the Eldar to free Isha from Nurgle’s garden to weaken the Chaos Gods in exchange for access to the Webway and anti-Chaos lore.

The Imperium and Eldar expect to go their separate ways after the Raid on Nurgle's Mansion, until Chaos decides to supercharge the War of the Beast in order to show those mortals what happens when you steal fire from the gods. The Chaos Gods don't manage to turn any primarch (though they get really close with Horus), the Emperor having told the primarchs what Chaos what it is and why it is important to not touch it beforehand. Humanity and Eldar are forced into an alliance once again, resulting in an Aesir-Vanir-esque political marriage between the Emperor and Isha. Although things are bad with the biggest green tide the Imperium has ever seen and Luther convincing the majority of Dark Angels to go traitor, they only gets worse when the true mortal catspaws are revealed.

Because that buff to competence and common sense? Chaos gets it too. And in a spectacular display of long-term planning, instead of consuming ALL of the pleasure cult-worshipping eldar in the Eye upon their birth, Slaanesh only consumed MOST of them. So now in addition to daemons, orks, and traitors, you have an entire army of insane, Chaos-worshipping fair folk who just declared holy war on the Imperium and their heretic kin.

And it all kind of spirals out from there.

Can also be found at Nobledark Imperium Drafts, the other main page for the project.

Shattered Imperium

The canon legions fracture into more than two factions. Imperial Fists, Raven Guard, Salamanders, and Blood Angels remain loyal to Emps. Sons of Horus, Word Bearers, Alpha Legion, and White Scars go Chaos. Thousand Sons, Iron Hands, and Emperor's Children go transhumanist. Death Guard, World Eaters, Night Lords, and Iron Warriors go egalitarian. And finally the Ultramarines, Dark Angels, and Space Wolves go independant of everyone.

MidHammer

The setting that tries to find a balance between the grim darkness of the original Warhammer and BrightHammer.

The Vulkanite Heresy

A less-grim, less-dark, but still solidly grimdark timeline. Vulkan can't stomach the purges of the Lost Primarchs and goes renegade. Eventually this makes him easy prey for Lorgar and Tzeentch, and Chaos gets a Heresy War. Featuring a mix of canon loyalists and traitors in the heretic faction, more renegades and semi-traitors (Oh, Hi Malal), and a decompressed timeline of events. Indexes Astartes are viewable on Ao3 and reddit, with some older material about the primarchs also on reddit. That will eventually be superseded by Biographica Primagenesis entries for them, and some Xenos entries, particularly for changes wreaked on the Eldar, will be inbound, but that will all be after the Index Astartes are finished.

Legions Reborn

New legions and Primarchs to lead them, not dissimiliar to the Hektor Heresy above. Wiki can be found here.

The Sangunary Schism

A fan heresy with Sanguinus as the traitor warmaster. No wiki yet cause the admin is tech illiterate https://www.facebook.com/SanguinarySchism/

If the Emperor Watched If the Emperor had a Text-to-Speech Device

Due to mysterious warp nonsense, the canon timeline just after the triumph of Ullanor when all the Primarchs minus Alpharius Omegon (who arrive later) were together receives the TTS videos and other Lexicanum, 40k Wiki, Codex and 1d4chan information in the form of videos and text files. The Emperor and the Primarchs (minus the twins who as stated arrive later and the lost two who were already purged) watch them to great hilarity. The main thread is on Spacebattles in this thread, while side stories and reactions to fanfiction, homebrews and other files like the wiki articles and the alternate heresies are on this thread. Main story is written by Praetor98 and sidestories of the main thread and all of the extras thread is made by readers.