Lorgar - Cull of the Word Bearers: Unknown to Erebus and Kor Phaeron, their primarch had also had a secret objective in mind when he had sent his two most zealous sons to Calth. After their humiliation at Khur, thousands of World Bearers within the Legion detested the Ultramarines. The Urizen ordered a great gathering of his Legion while their fleet was already en route to Calth. The primarch called for Argel Tal, the leader of the Gal Vorbak, and one other Word Bearer officer who would eventually become commanders and apostles amongst the elite Vakrah Jal. The primarch wanted their counsel on what to do with those amongst their Legion he no longer trusted. The Word Bearers had culled their ranks down through the decades, removing such unrepentantly Loyalist elements such as the Terran-born warriors of their Legion, but had carried out no purge like the Istvaan III Atrocity that Angron was so proud of. Lorgar knew that the loyalty of his own Legion to both him and his vision of Mankind transformed through an embrace of Chaos was never in doubt, but competence was another matter entirely. Lorgar asked what should be done with those warriors of the XVII Legion he felt were no longer reliable. Those whose hatred burned brighter than their sense. For tens of thousands of them -- whole companies, whole Chapters -- their rage was no longer pure. It was decided that these suspect elements of the Legion would be gathered into a single host and ordered to undertake the "sacred" mission to Calth to assault the Ultramarines that they had so craved. They were led by Erebus and Kor Phaeron and were expected to martyr themselves in glory. The other Traitor Legions such as the Emperor's Children, Sons of Horus and the World Eaters might have purged their own ranks at Istvaan III, but the Word Bearers had proceeded to purge their own at Calth.Though the XVII Legion had achieved a monumental victory of sorts, it was all a matter of perspective. Piercing the veil of the Warp, Lorgar had heard the whisperings of the Chaos Gods and had witnessed the truth for himself. Yes, Erebus had successfully conjured the Ruinstorm at Calth. But ultimately, Erebus and Kor Phaeron had failed to achieve their overall objectives: Roboute Guilliman was still alive, the Word Bearers had lost half the fleet at Calth to an Ultramarines counter-attack, and tens of thousands of Word Beaers, including the Gal Vorbak and mortal servants, had been abandoned to a useless subterranean war beneath Calth's irradiated surface while the two Word Bearers commanders had fled. This meant that the Word Bearers left behind were left to die, never to be reinforced. Never to be recovered. All those Gal Vorbak who had spent months of their lives fasting, praying, scarring their flesh in preparation for a chance to taste the Divine Blood, they had simply been lost for no real gain. Though Lorgar was somewhat displeased, Erebus had more or less achieved the base level of success required of him; the Ruinstorm had been conjured and the rogue elements of the Word Bearers had been culled. Now it was time for Lorgar to further his own plans and complete the campaign against the Ultramarines he had come to call his Shadow Crusade.