Editing Horus Heresy (section)

===Alpharius: Head of the Hydra===
Long story short, everything we’ve been told about Alpharius is [[Meme|true, from a certain point of view]] (or maybe not). Alpharius himself (unless it was actually Omegon) lands on Terra after the primarchs were scattered. He immediately senses that [[Omegon|some part of him is missing]], but before he can ponder this too deeply the Emperor finds him and brings him back to the Palace. He's raised in total secrecy by Malcador, who explains that he will be the Emperor’s hidden blade, the son who can strike from the shadows and weave deceptions of surpassing subtlety. The Emperor further explains to him that Alpharius' job will be to preserve the Imperium at all costs, no matter what he might have to do. Alpharius interprets this to mean that he should test the Palace’s defenses, so he breaks into the Imperial Dungeon, kills a Custodian and steals his armor, and sets up a fake assassination attempt on the Emperor. Constantin Valdor stops him, but Alpharius reveals that he had already hacked into an AA battery on the other side of the Palace and could have just shot down the Emperor’s shuttle at any time, proving his point and annoying Valdor. Alpharius and his legion go on to wage war in the shadows throughout the Great Crusade, using wetwork teams, deep-cover sleeper agents, and psyops to defeat the Imperium’s enemies. The XX Legion apparently has agents seeded throughout the galaxy, even on worlds that haven’t yet been contacted by the Imperium, and uses them as appropriate to destabilize governments or cripple armies and infrastructures prior to the arrival of other Legions. Alpharius claims to have fought alongside the Dark Angels in their first deployment (as seen in Valdor’s novel), and also claims to have been present for the rediscoveries of several of his brothers, disguised as members of their legions. He and his legion are shown to be content with their role as black operatives, though also a bit bummed that they don’t get to stomp around kicking ass and gaining glory like the rest of the Astartes do.

He later unmasks his legion’s existence to the Lion during the Third Rangdan War, and the account of this meeting directly contradicts the one from ''Scions of the Emperor'', in that this time Alpharius merely offers his legion’s support to the Dark Angels, rather than suggesting that the Angels withdraw and let the XX Legion take over. The truth probably lies somewhere between these two accounts. While fighting the Rangdan behind the scenes and dealing with civil insurrections, Alpharius gets wind of a mysterious warrior who may possibly be his missing twin on a world behind enemy lines. When he goes to investigate, he discovers that the world is being overrun by the [[Slaugth]], so Alpharius takes a small team in to find his brother. Most of his legionnaires die, but he finds Omegon (unless it's really Alpharius), and they sit down for a friendly chat. Omegon tells Alpharius that he fetched up on a deserted planet and stole a ship belonging to some space pirates in order to escape (unless he’s lying). They wonder if the Emperor had deliberately engineered them as twins or if they had been divided somehow by their passage through the Warp. Either way, they decide to keep the truth concealed from the rest of the Imperium, then escape the Slaugth together and start planning how to reveal Alpharius' existence to the Imperium. They decide to stage an attack on the ''Vengeful Spirit'', so Omegon sneaks onto the ship and fights his way to the bridge. Horus recognizes him immediately and is overjoyed to have found his last brother, who introduces himself to the Lupercal as Alpharius. This is followed by the last line of the novel: “This was a lie.” So does that refer to Omegon calling himself Alpharius, or does it mean that the entire story was all one big lie? Hydra Dominatus, ladies and gentlemen.

Throughout the novel, Alpharius comes across as a surprisingly philosophical person, often ruminating on his nature and that of his brothers. He isn’t particularly impressed with any of them except for Horus (Alpharius even expresses a foreboding worry that Horus is carrying too much on his shoulders), The Lion to a certain extent (whom Alpharius speculates was the only brother to see through him and sense the truth), Sanguinius (but he might be lying), and he reveals that he distrusted Rogal Dorn so much that he decided to plant some sleeper agents on Terra just in case. (Of course, one of these sleeper agents was Alpharius himself, according to ''Praetorian of Dorn'', so does this mean that the Alpharius who was narrating this novel is a disguised Alpha Legionnaire?)