Kiavahr - Battle of Ravendelve: Like the Lycaeus Uprising more than a standard century before, the Traitors planned their rebellion well, the Alpha Legion being rightly feared for its acumen in covert operations. Since their fall, the guildmasters had always maintained an extensive network of spies and informants, a network which was quickly overtaken by the Alpha Legion and extended through its own agents and of course those Alpha Legionaries in disguise within the XIX Legion.However it quickly became evident that while the Alpha Legion had little trouble in subjugating the Tech-guilds -- either through bribery or the simple prospect of a bountiful future under the Warmaster Horus' disinterested reign -- dealing with the Order of the Dragon was much more complicated. Several clues indicate that not even Omegon truly knew how far the order's influence went within the Mechanicum or what goal they truly pursued. It was then fortunate for the Alpha Legion that the Order of the Dragon had so willingly aligned its own objectives with that of Horus.While the Alpha Legion usually do not shirk from the thankless task of information-gathering and sabotage operations, on Kiavahr Omegon left those tasks mainly to his allies in the Tech-guilds. It was clear that the primarch would promptly sacrifice his mortal allies to ensure that his Legion would reach its goals.From the start, the Alpha Legion had planned on betraying its allies, necessary sacrifices to ensure the Raven Guard would be looking elsewhere when the XX Legion struck. For instance, Omegon did not hesitate to sacrifice an entire guild purely to ensure that one of his infiltrators would gain leave from the Raven Guard's fortress on Kiavahr of Ravendelve and would thus be able to secure the means to sabotage the precious purified, undifferentiated primarch gene-seed the Raven Guard had been give by the Emperor and was now using to rapidly expand their forces in the wake of the losses suffered during the Drop Site Massacre.While alerting the Raven Guard to the activity of the Tech-guilds, this action was only a minor event for what the Alpha Legion had planned next: the seizure of the primarch gene-seed. As a diversionary measure, the Order of the Dragon would reveal its hand and try to assassinate the Mechanicum's most powerful representatives within their own temples. However, even the Alpha Legion was not prepared for the devastation the order would unleash. Omegon had expected a military coup, an uprising at best, but what the Order of the Dragon delivered was a full-out civil war.An Alpha Legionary embedded inside the Raven Guard code-named "Alpharius" managed to corrupt the new Raven Guard gene-seed produced from the undifferentiated primarch gene-seed with extracted Daemon blood, which had the effect of turning the new Raven Guard warriors into uncontrollable, mutant abominations who soon ran amok in the Ravendelve.With this new advantage Omegon made his move, and the rebellious Tech-guilds were directed to attack the gene-labs at Ravendelve. The Traitor Tech-priests had considerable resources at their disposal, including the  Imperator-class Titan Magnus Casei, 4 Warhound-class Scout Titans, and cybernetic Skitarii soldiers. However this attack was purely a distraction on the part of Omegon, and the initial wave of rebel attackers was quickly slaughtered by the Raven Guard defensive emplacements.The true battle began under the roar of the Magnus Casei's guns, the Legio Vindictus Imperator-class Titan under the control of the Order of the Dragon. Unfortunately for the XIX Legion, they, or to be precise, their fortress of Ravendelve, was the target of the Titan's anger. The Raven Guard promptly responded, Ravendelve's macrocannon defence turrets quickly unleashing their fire upon this new threat.However, it rapidly became evident that the Magnus Casei was not the only god-engine of the Legio Vindictus to be controlled by the Order of the Dragon as no fewer than four Warhound-class Titans approached the complex, shielding an armoured column of insurrectionist forces.Simultaneously an Alpha Legion battle barge, supposed to be the Beta, arrived covertly at the Starfall Docks that were controlled by the Order of the Dragon, ready to ship yet more Legiones Astartes in disguise to the surface of Kiavahr. These Astartes would then join up with those having already infiltrated the XIX Legion. These infiltrators had been tasked with securing the landing pads as to better allow the extraction of the recovery team, once they had taken possession of the undifferentiated primarch gene-seed.While the Alpha Legion concentrated their attention on Ravendelve, the Order of the Dragon's main objective was the elimination of the Loyalist Mechanicum Synod present on the world. In this, however, their initial attack failed miserably. With the element of surprise now lost, time began to run in the Raven Guard's favour as the XIX Legion and their Mechanicum-allies mobilised.Omegon, supported by both Raven Guard infiltrators and 50 Legionaries from the Beta, intended to destroy the remaining stocks of gene-seed of the Legion and thus end any hope they had of rebuilding themselves. While Omegon directed his infiltrators to wipe out the Raven Guard gene-seed, the primarch himself stole the same gene-tech Corax had used to create the Raptors.While Omegon was successful in stealing the technology, his infiltration forces slew Chief Apothecary Vincente Sixx but were discovered by Captain Agapito Nev who had apparently uncovered the Alpha Legion's spies since before they arrived on-world. Cornered, the Alpha Legionaries were all struck down or committed suicide to prevent themselves from being captured.Shortly after Omegon departed the Ravendelve, Corax organised a general offensive against the now-abandoned rebel forces. Loyalist Skitarii and Titans from the Legio Vindictus joined the Raven Guard in securing Ravendelve, then driving the rebels from the rest of Kiavhar proper. Meanwhile, Horus received the supposed stolen gene-tech from Alpharius, but in truth the Alpha Legion twins had provided the Warmaster with a false and unusable copy, keeping the real technology for themselves so they could create new Astartes at will.