Jago Sevatarion - Drop Site Massacre: During the opening days of the Horus Heresy, after the news of the Istvaan III Atrocity was brought to the Emperor of Mankind by the Loyalists aboard the Death Guard Frigate Eisenstein, He ordered the combined forces of seven Space Marine Legions to assault the positions of Horus and his Traitor Legions in the Istvaan System. The Loyalist forces would attack in two waves and fall under the supreme command of the Iron Hands' Primarch Ferrus Manus.The Legions comprising the first wave were the Iron Hands, Salamanders, and the Raven Guard. The Legions comprising the second wave, who would arrive at Istvaan V after the first wave, were the Night Lords, Alpha Legion, Iron Warriors, and a large contingent of Word Bearers that their Primarch Lorgar had stationed in the star system. Unknown to Rogal Dorn and Ferrus Manus, the Night Lords, Alpha Legion, Iron Warriors and Word Bearers had all turned from their service to the Emperor and secretly pledged their loyalty to Horus, and been instructed to keep their new allegiance a secret.Ringing Istvaan V was one of the largest fleets ever gathered in the history of the human species. Without a doubt, it was the most impressive coalition of Astartes vessels ever gathered, with the Scouts, Cruisers, Destroyers and command ships of seven entire Legions present. The Imperium of Man had sent seven Legions to kill its wayward scion, little knowing that four of them had already spat on their oaths of allegiance to the Imperial Throneworld and its master.The Fidelitas Lex, Lorgar's flagship, played host to a gathering of rare significance. There were commanders from the Night Lords, Alpha Legion, Iron Warriors as well as three additional Primarchs: Konrad Curze, Alpharius Omegon and Perturabo. Lorgar strode to the centre of the gathering of Traitors. He proceeded to impress upon the gathering of his sons, brothers and cousin Astartes the importance of their cause, and of the significance this day would hold in history.The Word Bearers and their allies believed that the Imperium had failed them by being flawed to its core, imperfect in its pursuit of a perfect culture, and in its weakness against the encroachment of xenos breeds that sought to twist humanity to alien ends. And it had failed them, most of all, by being founded upon the lies of rationalism and atheism that defined the Imperial Truth.The Imperium had been forged under the aegis of a dangerous deceit, demanding that its citizens and their defenders sacrifice truth on the altar of necessity. This was an empire that deserved to die. And on Istvaan V the purge would begin.From the ashes Lorgar promised would rise the new kingdom of Mankind: an Imperium of justice, faith and enlightenment. An Imperium heralded, commanded and protected by the avatars of the Dark Gods themselves. An empire strong enough to stand through a future of blood and fire. At Istvaan V, the Traitors would declare their intentions openly. There would be no more manipulating fleet movements and falsifying Great Crusade expeditionary data. Now the Alpha Legion, the Word Bearers, the Iron Warriors and the Night Lords would stand together with their comrades in the Sons of Horus, World Eaters, Emperor's Children and Death Guard Legions -- bloodied but unbowed beneath the flag of the Warmaster Horus, the rightful second Emperor of Mankind, the true Emperor.When Lorgar had finished speaking, First Captain Sevatar was the first to declare, "Death to the False Emperor!" In so doing, he became the first living soul to utter those words that would echo from the throats of countless others through the millennia of the Long War that was to come. The cry was taken up by other voices, and soon it was cried in full-throated roars, "Death to the False Emperor! Death to the False Emperor! Death! Death! Death!"First Captain Sevatar had led his 1st Company elite, the Atramentar, to the surface of Istvaan V. Bronze chains wrapped their armour, leashing weapons to fists, as the Night Lords made ready for the coming signal. Following the first wave of attack and the bloodying of the three Loyalist Legions, the second wave of "reinforcements" eagerly awaited the withdrawing mass of Loyalists on the slopes of the Urgall Depression.The battered black armour of the Raven Guard warriors came towards the unified Night Lords and Word Bearers force. Both the Word Bearers and the Night Lords were to be the anvil, while the Iron Warriors would be the hammer yet to fall. The enemy staggered back to them, exhausted, clutching empty Bolters and broken blades, believing their "brothers' " presence to be a reprieve. Dragging their wounded and dead behind them, Corax and Vulkan led their forces back to the drop site to regroup and to allow the warriors of their recently arrived brother Primarchs of the second wave a measure of the glory in defeating Horus.Though they voxed hails requesting medical aid and supply, the line of newly-arrived Astartes atop the northern ridge remained grimly silent as the exhausted warriors of the Raven Guard and Salamanders came to within a hundred metres of their allies. It was then that Horus revealed his perfidy and sprung his lethal trap.Inside the black alien fortress where Horus had made his lair, a lone flare shot skyward, exploding in a hellish red glow that lit the battlefield below. The fire of betrayal roared from the barrels of a thousand guns, as the second wave of Astartes revealed where their true loyalties now lay.During the ensuing chaos of battle, the Gal Vorbak, (Colchisian dialect for "the Blessed Sons") of the Word Bearers Legion, revealed that they were Daemonhosts for the denizens of the Warp. Their flesh and ceramite fused and warped into a new, bestial form, marking them out as amongst the first of the Possessed Chaos Space Marines.To the Night Lords, the Gal Vorbak were so much more than merely foul, they were rancid with corruption. After the battle, when Lorgar's favoured son Argel Tal approached Sevatar to congratulate him on their victory, the First Captain removed his helm and spat on the ground by the Word Bearer's feet. Sevatar's attitude towards his erstwhile cousins had changed, and henceforth became openly hostile to the Word Bearers.