Editing Shattered Imperium (section)

==Timeline==
===The Purge Of The Unknown Legions===
Early in the Great Crusade, the 2nd and 11th legions strayed from the Emperor's light. In turn, he smites the legions with the aide of Russ, his executioner. Whilst several of the Primarchs feel that this action was necessary, Guilleman speaks out against it and is reprimanded by Horus and Dorn, who both feel he is overstepping his mark. Less publicly, Perturabo and Mortarion equivocate the Emperor to the tyrants of their own adoptive homeworlds.

===Lorgar's Shame===
The Emperor, fearing that two more of his sons have drifted from his will, devises a plan to test the loyalty of the 13th and 17th legions. Guilleman is ordered to destroy the city of Monarchia, the crowning glory of Lorgar's zealous crusade. Guilleman resists but eventually obeys when he realises that the Emperor is willing to set Russ on him if he doesn't. Lorgar and Guilleman come to blows after the incident and both of them lose their faith in the Imperium. Across the Legions, there is talk of whether or not the Emperor's judgment has been somehow impaired. Soon, Guilleman is back in Ultramar and Lorgar is facing the Primordial Truth.

===The Alpharius Gambit===
An Eldar/xenos cabal approaches the twin primarchs with a warning of the impending fall of Horus and the fracture of the Imperium. Their emissary implores the 20th Primarchs to slay Horus and Help the Emperor purge the Ranks of the Astartes legions. The twin Primarchs slay the foul xenos and set off to find Horus at once. Along the way, they examine evidence of the Primordial Annihilator, seeking to understand this bizarre force so they can harness it.

===The Nikaea Schism===
After years of open hostility between Magnus, Mortarion, the Khan and Russ, the Emperor calls a trial to discuss the use of Psykers within the Legions. Mortarion makes an impassioned speech about the dangers of the Librarian cult and the troubling rituals that the Khan and Magnus have engaged in. Magnus responds with his own belief that humanity must be ascended to survive some unkown horror that he perceives in the future. The Khan and Russ trade insults for a while before the Emperor makes his judgment known. The Librarian cults will be permitted to continue and will be implimented within all legions, to hasten the ascension of the Legions. Mortarion leaves the conclave, completely disillusioned with the Imperium. He seeks out his like minded brothers to discuss a response to this betrayal. Meanwhile Magnus, overjoyed by the Emperor's wisdom, commits his legion to the Crusade with new vigour.

===The Fault In The  Stars===
On Davin, Horus is seduced to Chaos by his brother Lorgar. Magnus is never made aware of the peril his brother faces as he is away from Prospero. The Alpha Legion arrive soon thereafter, already twisted to the Malign will of Tzeentch by their quest to understand Chaos. Together, four Primarchs plot their Heresy.

Magnus joins Ferrus Manus and Fulgrim in a joint crusade to crush an Eldar Craftworld. While there, Magnus discovers that Fulgrim has been tainted by the malign influence of a daemon-blade. He informs Manus and together they help stop the insidious creep of Chaotic influence over the 3rd legion. Magnus explains what has happened to his deeply concerned brothers and explains how he has saved Fulgrim from possession. Fulgrim devotes himself to Magnus' cause. Ferrus Manus takes more convincing but ultimately agrees that psykers are more powerful and so must be made superior. Together, they plot a new future.

Mortarion meets with Perturabo and Angron. The Iron Warrior is attempting to rid the Red Angel of his Butcher's nails using a bizarre new invention of his. Mortarion and Perturabo are overjoyed by the apparent success of the procedure, but it isn't long before Mortarion begins discussing the results of the Nikaea conference. Perturabo is dumbfounded by this revelation. Together, the three Primarchs agree that they must save Humanity from the madness of Magnus the Red and the Emperor. But first, Perturabo wishes to Seek out the mad Primarch Curze, and cure his insanity

In the deep, Russ and Lion El Johnson battle over past wrongs and minor slights. Both of them are driven by a sense of betrayal. the Lion is furious that Horus Lupercal, not he, was made Warmaster. The Wolf refuses to allow Maleficarum to take hold of his legion. Both Legions throw off the shackles of imperial law to impose their own.

Jaghatai Khan strives for perfection and speed. His White Scars engage in shamanistic ritual sacrifice and indulgence in order to gain the blessings of the various spirits. When Horus calls on his brother to join him, the Khan is already well and truly damned.

===The Isstvan War===
Magnus is summoned to Isstvan by his brother Mortarion. The Death Lord wishes to mend old wounds and hear more of Magnus' plans. Happy to hear that his brother has seen the light, Magnus sets out, with his two likeminded brothers, to bring the Death Guard into the fold.

When they arrive, the Ascenionist fleet finds not one, but three legions arrayed before them. The Death Guard, Iron Warriors and World Eater fleets wait patiently over Isstvan 3. Mortarion greets the Ascensionists and invites them to the capital city of Isstvan 3, to meet with their brother. Weary, but ambitious, Magnus accepts and leads his three legions to the surface.

He talks with Mortarion at length about the threat of Chaos and the the neccessity of knowledge. Perturabo seems the most receptive to Magnus's arguments and they discuss, at length the ascenionist plan. Suddenly, without warning, Mortarion's forces open fire on the Ascencionists. Magnus barely escapes the clutches of Perturabo. His own son, Ahriman, sacrifices himself for the Thousand Sons to escape the planet.

Battered and shocked, Magnus leads the Ascenionist fleet away from Isstvan 3 at best possible speed. As they reach Systems edge, an astropathic message is recieved. Prospero has been destroyed by the Space Wolves. Chemos and Medusa have been purged by the Night Lords.

Blinded by rage and grief, Ferrus Manus and Fulgrim turn their forces back toward their would be assassins. Magnus has no choice but to join his brothers or see them destroyed. What follows is a chaotic, violent maelstrom of void combat and planetary bombardment.

When word reaches the rest of the Imperium that 6 legions have turned on one another in the Isstvan system, the warmaster declares all of them traitors and rallies a force to cleanse them. The Sons of Horus, the Word Bearers, the Alpha Legion, The White Scars, The Raven Guard, The Salamanders and the Blood Angels. Seven legions to destroy six.

The Warmaster's fleet arrives to find both enemy fleets scattered, Isstvan 3 a lifeless husk and a brutal ground war underway on the barren world of isstvan 5. Horus orders Sanguinius to lead Corax and Vulkan to the ground on Isstvan 5 immediately. The Blood Angel gladly complies and deploys 3 assault legions to strike for the heart of the melee, where Magnus and Mortarion are locked in duel.

Nine legions, locked in a battle of cyclopean scale, await the second wave of loyalists. Instead, they are all of them betrayed. Horus begins an orbital bombardment of the battlefield, slaying Ascensionists, Loyalists and Free Legion forces alike. The Warmaster makes an announcement to the beleaguered forces below. They may join him in his new dark crusade to claim Terra, or they may die in the sand. All nine Primarchs spite the name of Horus. Amused but unsurprised, Horus prepares to destroy Isstvan 5.

On the ground, a truce is formed. The nine legions, battered and bloodied, forestall their current conflict in the name of survival. The ships of all nine legions focus their attention on the Warmasters fleet in the hopes of gaining enough time to evacuate the armies on the ground.

The fighting  is intense, and Horus is forced to surrender his position above Isstvan 5 to the overwhelming firepower of his foes.The Free Legions, Aided by the sudden appearance of the Nightlords, inflict heavy casualties on the Traitors before fleeing the system. 

Sanguinius and the Loyalists save the few remaining Ascensionists and flee towards Terra. Magnus repays the mercy of the Blood Angels by stealing several of their ships to carry his remaining followers towards some unknown goal on the edge of the Imperium.

Horus rallies his armies, declares a victory for Chaos and prepares to set his brothers to the task of carving up the Imperium.