Xana Incursion - Hour of Execution: The lords of Xana had been deceived, and by that deception the Loyalists' bloody stratagem had borne fruit. Some three solar hours after the initial exchange of fire of the engagement against the Loyalist raiding fleet led by the Amphion, the full forces of the Mechanicum's void defences had been drawn out and committed to the battle, Xana II's long-range munitions had been expended and their warships were now locked in close-quarters fighting with the Terran battlegroup.The Xanite vessels were now simply too far away to defend their home Forge World, or more importantly, protect the huge supply fleet that lay at anchor in the Xana I debris belt, when a new Loyalist attacker, the deadly Dark Sovereign, launched her own devastating surprise assault from within the gas giant of Xana I's atmosphere.Amid this general chaos, the sudden battle on the moon of Xiphon-Tisiphone went all but unnoticed as another lie was revealed, and those who had masqueraded as the Sons of Horus and the emissaries of the Warmaster revealed themselves to be cut from entirely different cloth. Legiones Astartes they were for the main, but they were not Malcador's chosen -- later to be called Knights-Errant -- these were the bitter fall-out of Legions who had turned Traitor while they had remained loyal, a decision many had already paid for in blood and sinew in battle against those who they had once called brother.Their leader was Endryd Haar, a World Eater once, and it was he who had passed for the Sons of Horus warlord Koraddon, who it is likely that he himself had earlier slain. He and those with him had by brutal surprise attack taken over command of all three of the Ordinatus intended as gifts for the Warmaster, and now with malign savagery, turned their dread power on their creators.First, the escorting guardian-automata had been shot down and crushed by the Sons of Horus-liveried Mastadon heavy tanks that had served as Koraddon's honour guard, before the baleful power of the sonic disruptors of the Ordinatus had swept nearby Xanite armour and support vehicles to oblivion.The anarchy was further accelerated when the Loyalist Techmarines compromised the local djinn command skein by interfacing with the shattered remains of the Archmagos Gilim Raijan to operate the remote release on the collars of the thousands of remaining war slaves who were to be used in the bloody demonstration of the Ordinatus' power. These armed slaves, once free, fled where they could, spreading further the disorder and wild violence that had been unleashed.The desperate bid to seize the highly prized Ordinatus was only the beginning of the operation on Xana-Tisiphone. The huge warship which had brought the supposedly Traitor delegation to Xana, the Cicatrice Tyrannis, dropped lower into Xana-Tisiphone's orbit, placing the shadow of the moon between her and Xana II, shielding herself from any retribution that was to follow as her crew ignored all requests to attack the Dark Sovereign or otherwise aid the defence against the Loyalists.The Cicatrice Tyrannis then commenced her own company-scale ground assault on Xana-Tisiphone, Stormbirds and Thunderhawk gunships descending as the power of the Ordinatus was turned upon the cyclopean gates of the great prison-forge of Tisiphone-Shaol, sundering them.