Alpharius Omegon - Blockade at Chondax: Next, Alpharius dispatched his forces under the orders of Horus in an attempt to blockade the White Scars from leaving the Chondax System and joining up with the Loyalist forces on Terra. The White Scars only became aware of the larger galaxy-wide conflict of the Horus Heresy when Omegon initiated a mission to destroy Tenebrae 9-50, an asteroid facility that was being used as an Alpha Legion garrison.This Alpha Legion outpost had been utilising a nearby array of xenos constructs similar to Cadian Pylons that acted to close off Warp activity in the affected region in order to jam any astropathic communications so that the White Scars would remain ignorant of the Warmaster's rebellion. Omegon despatched an Alpha Legion Effrit Stealth Squad led by Sheed Ranko on a one-way suicide mission to destroy the facility. It was later believed that Omegon possibly fabricated the claim that the outpost was leaking information to the Loyalists and had therefore become a liability. After the destruction of Tenebrae 9-50, the pathways of the Warp in the region became sedate once more, which allowed the White Scars to receive word of Horus' rebellion from Rogal Dorn on Terra.As the White Scars fleet made preparations to depart the Chondax System, it encountered a massive Alpha Legion flotilla. The Alpha Legion were an unknown quantity to the White Scars. The Alpha Legion vessels did not respond to communication requests and had hung back on the edge of the star system, quietly accumulating more warships across a wide sweep of local space. There was no response from the XXth Legion's command despite all queries.The White Scars vessels were ordered not to escalate the situation and not to fire upon the interlopers unless fired upon. The warriors of the Vth Legion were ordered to maintain perimeter integrity and not to permit Alpha Legion spacecraft to penetrate within range of the core White Scars fleet. Jaghatai ordered his fleet to prepare for immediate departure.As the White Scars' vessels began to move for Warp translation, the Alpha Legion vessels reacted. They maintained the integrity of the cordon, warding the routes to the nearest suitable Warp jump-points and keeping the White Scars corralled within the vicinity of Chondax. Utilising the superior drives of their vessels, in an instant, they suddenly switched from an aimless drift-pattern into an arrowhead shock assault of astonishing precision. Though both sides engaged one another in a surprisingly ineffective firefight, the White Scars ultimately made good their escape and fled the Chondax System, having taken little damage while the Alpha Legion fleet had acted in ways that had led to the loss of a large number of its escort vessels.Alpharius or Omegon's dubious agenda in service to the Traitors' cause ultimately came to light at Chondax, where they had been operating under orders from Horus to recruit the White Scars into the Traitors' coalition, not to assault them. Instead, the Alpha Legion fleet there had initiated hostile actions to seemingly provoke the Scars into a fight after blockading them long enough for them to get word from Rogal Dorn on Terra of Horus' treachery and to receive his orders to immediately return to aid in the defence of the Throneworld.Indeed this message had only been delivered because of Omegon's destruction of the Alpha Legion-occupied Cadian Pylon array blocking the White Scars' communications. The Alpha Legion, or at least secretly Loyalist elements within it, had made sure that Jaghatai Khan would join the Emperor's cause and aid in the defence of Terra. That the Alpha Legion was subtly undermining the Traitors' agenda did not go entirely unnoticed, particularly by the Primarch Mortarion, who raised the issue with Horus to little response.