Below is a framework in how many of the characters and groups in the 40K universe would be affected by this alternate reality.
Hope you enjoy reading it. Comments and feedback are welcome.
EDIT: All legions now accounted for!
WARHAMMER 40000: THE GUILLIMAN HERESY
- Horus never turned, thus the Horus Heresy does not happen.
- Guilliman turns to Chaos, becoming the Arch Traitor of the story.
- The Guilliman Heresy takes place in roughly the same time-frame as the Horus Heresy.
- Certain events are different than the canon, a few even taking place before the Guilliman Heresy.
- After the Emperor's placement on the Golden Throne, Horus becomes the Leader of the Imperium of Mankind.
- Orks: nothing changed from canon.
- Eldar: nothing changed from canon.
- Dark Eldar: nothing changed from canon.
- Tau: Horus has Ultramar scoured of Guilliman's influence after the Heresy, leaving a vast majority of the Eastern Fringe empty, which eventually allows the Tau Empire to expand much further than before. They come into conflict with the Imperium often, but there have also been times when temporary alliances have been struck between the two, so that they can defeat a common enemy.
- Necrons: nothing changed from canon (they follow the way they are written about in Fifth Edition).
- Tyranids: somewhat changed from canon. As the Imperium is less fragmented than in the canon, it poses somewhat more of a threat to the Imperium. In response, the Tyranids have increased their efforts to destroy them.
- Guilliman presents his Codex Astartes to the Emperor, but it is rejected and cited as dangerous and restrictive.
- Guilliman turns to Horus for support, but does not receive it. Horus agrees with the Emperor, adding that the adaptive strategies of Alpharius should be learned from instead.
- Guilliman returns to Macragge to brood in solitude, all the while building his dislike for his father and Warmaster Horus. In this seclusion, Chaos whispers to him the promises of power, control, and revenge. With his ego badly bruised, Guilliman all too easily accepts the offerings of Chaos.
- Guilliman's betrayal of Mankind to Chaos caught many off-guard, and he came far closer to victory.
- Guilliman's dislike of Alpharius (being elevated as the better strategist) and Horus (becoming Warmaster) were contributing factors in his corruption.
- The Codex Astartes is renamed Codex Chaotica, and even after the failure of the heresy, it is strictly followed.
- Post-Heresy, the Ultramarines are renamed the Omega Legion. They also blacken their armour and invert the omega symbol whilst joining it with a Chaos star.
- Marneus Calgar becomes Legion Commander of the Omega Legion, and Lord Ascendant of Chaos. He can use his terrifying influence to unite the other traitor legions if required.
- The Omega Legion now resides in the Eye of Terror, as do all of the traitor legions.
- Remain loyal, and truthfully, they never liked Guilliman and the Ultramarines that much anyway!
- Cabal prophecy is slightly different this time around. Regardless, Alpharius remains with the good guys.
- Was one of the legions present during the Siege of Terra.
- At a later date, when the Alpha Legion infiltrates the Omega Legion's base of operations, Alpharius is killed by Marneus Calgar...or so it would seem (remember, they're all Alpharius!).
- The legion maintains its adaptive battle strategies and omni-directional attack patterns after the heresy.
- Knowing he would never turn willingly, Guilliman arranges an event to corrupt Sanguinius, similar to the one used to corrupt the Death Guard in the canon fluff.
- Trapped in the Warp, their Red Thirst and Black Rage flaws are twisted and amplified by Nurgle. This turns the once angelic marines into savage eaters of flesh and drinkers of blood.
- Sanguinius is warped beyond comprehension, his wings and flesh rotted to near-nothing.
- During the Istvaan V massacre, Sanguinius is killed by Angron, who cleaved his brother's head clean off with his giant chainaxe.
- The legion changed its scheme to that of the canon's Death Company.
- The Blood Angels are lead by Blood Lord Dante.
- Follows canon events until Kor Phaeron and Erebus suggest that Lorgar worship Chaos. At this point, Lorgar flies into a rage at the notion of heresy by his trusted advisors, and attempts to kill them before they flee.
- Lorgar saves Horus from the Davinite plot, with help from Magnus and Horus' Mournival.
- Remorseful for almost losing his brother, Lorgar has his legion purged of religious thought and becomes a staunch advocate of the Imperial Truth.
- Civil War breaks out on Colchis, with supporters of both religion and atheism assaulting one another, resulting in the destruction of the legion's home-world.
- After relocating to another planet, Lorgar begins working on and eventually founding the Adeptus Atheistica, which is a direct-opposite of the Echlessiarchy in canon.
- Lorgar disappears sometime after the founding of the Adeptus Atheistica. It is believed by some within the legion that he is still feeling guilty over almost losing his brother, and the death of his father, and has gone on a solo-crusade to bring the Imperial Truth to the entire galaxy.
- Leman Russ' corruption begins when the Council of Nikaea votes in favour of Psykers, enraging the Primarch.
- His hatred against Psykers is answered by Khorne.
- Although not directly allying with Guilliman, the Space Wolves use the Guilliman Heresy to attack Prospero, and destroy both Magnus and his Thousand Sons legion.
- In fear of losing the battle against Magnus, Leman Russ prays to Khorne, and is transformed into a daemonic werewolf, roughly the same size as Magnus.
- Leman Russ appears to slay Magnus, but not before Magnus sacrifices himself to banish Leman Russ and the Space Wolves from physical space.
- The legion is currently lead by Logan Grimnar, Skull Lord of Fenris.
- The legion has no Psykers, as Leman Russ had them all killed before his "death".
- The armour of the legion is now heavily stained with the blood of their victims, and decorated with skulls.
- Magnus remained loyal, and never damaged the Imperial Webway, as Horus never turned.
- He was heading for Terra to assist its forces against Guilliman, when he was alerted to an attack on Prospero by the Space Wolves.
- He fell in battle against a Khorne-powered Leman Russ, but managed to banish him and the Space Wolves before he succumbed to death.
- The legion is now lead by Ahriman.
- With almost all recruits having Psyker potential, the Thousand Sons train harder than other legions in the use and misuse of their powers.
- The librarians of the legion are known for crippling the physical prowess of their opponents.
- Konrad stays loyal, and never issued Exterminatus on his homeworld.
- With assistance from Horus, Konrad is able to restore order to Nostramo.
- After the Heresy, Nostramo comes under attack from the Raven Guard, and Konrad engages Corax, but is killed. However his death spurned his legion on to victory, driving the Raven Guard from their planet.
- The Night Lords still retain their use of terror tactics.
- The legion strongly believes in the protection of humanity and the annihilation of Chaos and those who consort with them.
- Corax sided with Guilliman for unknown reasons.
- His legion was decimated during the Istvaan V massacre, and was forced to use forbidden genetics to rejuvenate its numbers.
- After several failures, Tzeentch answers Corax' pleas, and restores them all, but turns them into mutant "werebird" daemons.
- Corax himself is severely changed into a Daemon with large black talons and multiple wings.
- The legion operates under its own agenda, and often stalks its prey from the shadows.
- Corax assaults the Night Lords' homeworld and kills Konrad Curze, before being driven from the planet.
- At a later but unconfirmed date, Corax lead the Raven Guard against the Blood Angels. His existence after this shocking and gruesome battle is unknown.
- Lion El'Jonson turns to Chaos, whilst Luther remains loyal.
- Although not truly certain, it is believed that the Lion was somehow corrupted during his absence from Caliban.
- When the Lion returned, he attacked his fellow Dark Angels, catching them by surprise.
- Luther confronts the Lion, and the two battle it out as they did in canon.
- Luther kills the Lion, but Caliban is then attacked by a Warpstorm, tearing it apart and sucking in everyone unprotected, including Luther.
- In the Warp, the souls of Luther and the Lion continue to wage eternal battle against one another.
- The Dark Angels are now split in two; the Redeemers who remained loyal are lead by Lord Cypher, and the Fallen Ones, lead by Azrael.
- The Fallen Ones worship Chaos as a pantheon. They also do not work with other traitor legions, and especially do not tolerate interference from Calgar and the Omega Legion.
- The legion keeps its original name and does not change it.
- Angron and his gladiator allies are assisted by the Emperor and the Custodes on his homeworld. When the world is saved from the oppressors, Angron pledges absolute loyalty to the Emperor of Mankind.
- The War Hounds become the shock troops of the Imperium, often deployed where others might fail.
- Psycho-surgery is stabilized and perfected post-heresy.
- Angron defeated his corrupted brother Sanguinius during the Istvaan V massacre.
- Angron was brought down during the First Battle of Armageddon by the Daemon Wolf Leman Russ.
- The legion is lead by Legion Commander Khârn, whom bears hatred towards the Space Wolves for the death of his Primarch.
- The legion has few Psykers, however those within the War Hounds use their powers to enhance their own physical attributes.
- Horus remains forever loyal, having been saved by Lorgar and Magnus from the Davinite cults.
- After the Emperor's passing, Horus is declared leader of the Imperium.
- One of Horus' first acts is to scour the Realm of Ultramar of Guilliman's influence.
- Horus never splits the legions up into chapters, as Guilliman did in canon.
- Under Horus' rule, organizations such as the Echlessiarchy are never created, as they directly oppose the Imperial Truth.
- The Luna Wolves become as large as the Ultramarines were in canon.
- With Horus ruling the Imperium, the legion itself is lead by Legion Commander Abaddon.
- Fulgrim declares Exterminatus on Laer instead of exploring the temple with the corrupt blade. Thus, Fulgrim never turns.
- Fulgrim confronted Guilliman on Terra. As Guilliman could not turn Fulgrim to his side, he killed him (as opposed to Horus killing Sanguinius in canon).
- The legion is now lead by Legion Commander Eidolon.
- Although Lucius does not turn to Chaos, he is killed at a later point by a Slaanesh-corrupted Jubal Khan of the White Scars.
- Jaghatai Khan and his legion turned to Slaanesh worship at an unknown point before the Guilliman Heresy.
- They were recruited to Istvaan V, but kept their changed allegiance hidden until the last possible moment.
- They were the legion that caused the most loyalist casualties of the massacre.
- The White Scars take excessive pleasure in hunting down and torturing their prey.
- After the heresy, Jaghatai Khan is presumed to have gone after the Dark Eldar in the Webway, and bring their dark and depraved souls to his god.
- The legion is currently under command of Lord Jubal Khan, whose body has been fused to a daemon-enhanced Moondrakkan.
- They remain loyal, or rather within the Imperium, until Ferrus Manus is told of Fulgrim's death at the hands of Guilliman.
- Ferrus Manus blames both sides for what happened to Fulgrim, swearing revenge against them all.
- At Ferrus Manus' instruction, the Iron Hands purge flesh from themselves and become almost akin to Necrons, thus no longer being considered human.
- They harvest technology of all sorts, even xenos technology.
- The legion is known for grafting weapons and armaments of all sorts onto their bodies, such as those from the Necron and Tau.
- Ferrus Manus' status and location are unknown.
- Perturabo remains loyal, and successfully puts down the rebellion on Olympia without resorting to genocide.
- They were on Terra during the heresy, tearing down the defences of the corrupted Imperial Fists.
- After the heresy, they were promoted by Horus to be the Praetorians of the Imperium.
- Perturabo was injured by Rogal Dorn during a post-heresy battle. Although not killed, he was interred inside a Primarch-sized Dreadnought, which would later by known as the Obliterator. The Obliterator can change weapons on the fly and is slightly larger than a canon Dreadknight.
- Their rivalry with the Imperial Fists continues to the present day.
- Perturabo is awakened to fight on Armageddon, where his nigh-invincible machine-form slays the Daemon Primarch Vulkan.
- The Pain Glove is presented to Rogal Dorn by Guilliman, whom intends to corrupt Dorn with the gift.
- Dorn and the Fists eventually become corrupted warriors of Chaos, their defences nigh-impregnable...
- ...until the Siege of Terra, when the Iron Warriors tear them down and cripple the Imperial Fists.
- The legion is later renamed the Fists of Darkness.
- Their colours change to rusty yellowish chrome.
- The legion worships Chaos as a pantheon.
- Mortarion remains loyal, and him and his legion fought against the traitors on Istvaan V.
- Their flagship is still sucked into the Warp.
- Typhus' treachery is discovered early when he tried to slay their flagship's navigators.
- Typhus escapes, but later resurfaces during the First War of Armageddon. It is here that Mortarion fights him, but is slain.
- Command of the legion then falls to Nathaniel Garro.
- The legion relocates from Barbarus to a fertile green world.
- Turned to Chaos for reasons unknown.
- Vulkan prayed to the Chaos pantheon and all of his nine artifacts were enhanced with Warp powers.
- The Salamanders, contrary to their fluff, now abhor humanity after the heresy, seeing themselves as vastly superior.
- The legion likes to bombard their targets with flame and melta weapons from orbit, before descending and mopping up what is left.
- Vulkan was slain on Armageddon by Perturabo, and his nine artifacts were scattered throughout the galaxy.
- The legion is currently under the command of High Sorceror Vel'cona, who delights in immolating those who displease or disobey him.
MORE TO COME, VERY SOON!!!
Edited by ShasVa, 12 January 2012 - 07:06 AM.