Editing Primarch (section)

===Traitors===
*General downside to those who became Daemon Princes is that the further they go from the Eye of Terror, the more their power wanes. Also most of them spend most of their time in the Great Game (eternal war in the Warp), growing increasingly distant from the real world affairs.
* '''Horus''' was killed by the Emperor during the Siege of Terra, who utterly destroyed his soul. His legion enshrined his corpse until the Emperor's Children stole it. [[Fabius Bile]] managed to successfully clone him, but [[Abaddon]] killed the clone to cement his position as his successor as Warmaster of Chaos. While "Horus" is supposedly ''very'' dead, which was his fault for being a fuckwit, shards of his soul which were broken off in the Warp remain. Including one in the realm of Khorne...
* '''Konrad Curze''' allowed a Callidus assassin to infiltrate his lair and kill him, either because he himself became the thing he hated the most, or to justify to himself that every atrocity he has done in the name of justice was a necessary act. Except...there was that crown he always wore, the one with a stone in it that looked oddly similar to a soulstone...
* The Alpha Legion's story is a bit complex:
**'''Alpharius''' was slain by Rogal Dorn in combat during the Battle of Pluto. He is very much dead as he did not bargain with the Dark Gods and had his head split open by a fellow Primarch's chainsword. Conspiracy theorists will speculate that it wasn't really Alpharius, though the death is strongly corroborated by Omegon's response. So unless Alpharius used a body double to trick Rogal Dorn AND ''his own twin'', into thinking he was dead and allowed Omegon to take his place and identity permanently; (or his twin merly acted as if he had died as part of the ruse, this is the Alpha Legion triple mind gamesa are kinda there thing) there isn't any hard evidence to suggest that the dead "Alpharius" was anything other than the actual Primarch, but knowing the Alpha Legion that doesn't mean too much without definitive proof.

Actually, screw all that.
Following the novel "Alpharius Head of the Hydra" it is revealed that Alpharius and Omegon exchanged identities the moment Omegon was found because Alpharius had been instructed by both the Emperor and Malcador to act as the hidden sword of the Imperium ever since he was found immediately after the scattering of the Primarchs; giving credit to that, the Alpharius acting as the public face of the Legion is secretly Omegon, while the one identifying as Omegon is the real Alpharius. 
Going by this, Alpharius has always been loyal to the Emperor, while Omegon probably believed the Cabal and decided to aid Horus (this would be further confirmed by several novels in the Horus Heresy series that showed entire contingents of Alpa Legion Astartes breaking down into civil war) and died at the hand of Rogal Dorn for that.

**'''Omegon''' reluctantly took Alpharius's identity after he sensed he was dead, and his legion a bee-line for Ultramar after the Horus Heresy, where he met his end after dueling [[Roboute Guilliman|Big Bobby G]]. However, because the rest of the Alpha Legionaries did not break even after the death of their primarch ''(in fact they managed to beat the Ultramarines in the conflict altogether);'' nobody could truly confirm if they did indeed kill the real deal, or if it was a body double.
**While it's been established that a decent amount of Alpha Legionnaires were surgically altered to resemble their Primarch and even ''believe'' they were Primarchs themselves; that and the figurehead role of "Alpharius" has been largely interchangable between both the twins and their sons, which makes sense for a legion whose MO is flexible leadership. While we can be reasonably certain that at least one of the twins is dead, whatever "Omegon-Alpharius" or at least whichever person who thinks he's Alpharius have been up to following the Heresy is a matter of fierce debate and speculation.
**One warband of the Alpha Legion believes that Omegon is still alive in the 42nd millennium and somehow certain elements of the Necron knows where he is. And there is that one big guy in scaled armor trapped in Trayzn's toybox...
* '''Angron''' is a Daemon Prince of Khorne. Still gets shit done, but did get his arse handed to him by the Grey Knights on Armageddon.
* '''Mortarion''' is a fucktwit who rarely does anything of interest (still sulking over his eternal existence as the thing he hates the most), but is a Daemon Prince of Nurgle. Apparently now holds the largest domain in the Eye of Terror, rather than just one planet he had in the old fluff. Got some open heart surgery, courtesy of Draigo/Ward. Created zombie plague from one of the artifacts Abbaddon used in his XII crusade. He invaded Ultramar after hearing news that Guilliman's finally awake, though he ultimately had to go back to the [[Scourge Stars]] due to his poor fortunes in the war as well as being summoned back by his patron God.
* '''Fulgrim's''' soul was trapped in a painting while his body was possessed by a daemon for a brief time before swapping places with the daemon and taking its powers (or so he claims). The first Primarch to become a Daemon Prince, although he aimed at achieving (demi)godhood instead (by sacrificing Perturabo). Abandoned what remained of his legion to rule his pleasure daemon world, and [[Troll|didn't tell them how to get there]] (yet Abaddon somehow manages to contact him anyway).
* '''Lorgar''' is a lazy fucknut who does nothing since they fled to the Eye of Terror, and handed the rule over his legion to the council of Dark Apostles, but still a Daemon Prince of Chaos Undivided. Taught Abaddon how to summon daemons. Lost a duel with a powered-up Corax during sometime after the Heresy.
* '''Perturabo''' becomes irrelevant after he goes on to drop largely out of post-Heresy fluff, but is still a Daemon Prince of Chaos Undivided. Rules the most stable planet in the Eye of Terror, where he does nothing but watching his sons sieging each other. Helps Failbaddon in a couple of Black Crusades by giving him some Daemon Engines. It doesn't really help, but it's more than Lorgar's done for Chaos Undivided. He is also leading his Legion after the 13th Black Crusade in their new offensive against the Imperium.
* '''Magnus the Red''' got broken into several pieces during his fight with Leman Russ, with several of them actually believing they were the real Magnus and going their own way. Some pieces were eventually put back together to form "the Crimson King", the Daemon Primarch form of Magnus who joined Horus in his rebellion. This sometimes also gets shit done, leading armies to the [[Space Wolves]]' planet and screwing with the Imperium, keeping his big red trollface on all the time until he gets his ass tossed back into the [[Warp]]. Other fragments seem to be floating around throughout history, appearing to have their own agenda, pretending to be daemons or helping the Imperium from time to time. By the time of the Gathering Storm and the 42nd Millennium the disparate fragments have mostly recombined to the Crimson King ''(leaving out a few key elements, namely the ones who embodied his best qualities; for example, the part of Magnus that embodied his love for his Legion chose to fade into nonexistence instead of being reabsorbed into the Crimson King)'' making him as whole as he can be.