Kyril Sindermann - Revelations: The secrets that Veritus long held spilled from him to Inquisitor Wienand as he knew his end drew near. He revealed that the secret Grey Knights Chapter had been preparing over the centuries for the time when they would be needed. They were a force of warriors without peer, engineered from gene-seed taken from the Emperor Himself a thousand Terran years earlier in the final days of the Heresy. The Grey Knights were a last, parting gift from Mankind's God before He was taken from them to sit upon His Golden Throne. Veritus explained that they were greater than the peerless warriors of the Adeptus Custodes, as each Astartes of the Grey Knights was a potent psyker. The Grey Knights' strength was in their brotherhood. As the end had approached, the Emperor had foreseen a need for warriors who could stand against the threat of Chaos, incorruptible and mighty, and He made them so, the mightiest warriors beside the Primarchs He ever created. For them, the daemon held no fear.The secret of the Grey Knights had been Veritus' to bear for many standard years -- assassination and execution had been the sentries of knowledge employed by the four founders of the Inquisition to maintain the secret of their existence. Veritus himself had employed Exterminatus on three occasions to keep the Grey Knights hidden, for this was how delicate the matter of the Grey Knights' existence was. That is why he could not utilise them to face the threat of the Orks during the War of the Beast, for they were too valuable a weapon against Chaos. Veritus also revealed that the mad Lord Protector Drakan Vangorich had more than likely poisoned him and that he was slowly dying, but that Vangorich likely had given Wienand an antidote to save her from the poison that was killing him, as the Lord Protector harboured romantic feelings towards her.During his meeting with Wienand, the ancient Inquisitor collapsed from the poison that had been secretly administered by Vangorich over a matter of solar days as a harmless gas, which only became lethal once it mixed with the life-sustaining chemicals of Veritus' own Power Armour. Wienand desperately rushed the stricken Veritus to the Inquisitorial Fortress on Terra to seek medical treatment, but it was for naught. As Veritus lay dying, he was able to awaken long enough to reveal that he was one of the four original founding members of the Inquisition.He then gave Wienand the key to the Citadel of Titan and named her his successor. She would be the liaison between the Inquisition and the secret Grey Knights Chapter, who were stationed on Titan. Veritus urged Wienand to work with Vangorich to preserve the Imperium, so that it would not fall into internecine conflict and civil insurrection, and to bide her time before she made her move to remove Vangorich from power. He then bade her to go to Titan and seek out the Supreme Grand Master Janus, the commander of the Grey Knights.Before he died, he revealed to Wienand his greatest secret -- that he was, in actuality, Kyril Sindermann, the chief Iterator of the 63rd Expeditionary Fleet of the Great Crusade. He had been present during the beginning of the Age of Darkness that was the Horus Heresy -- having witnessed the Warmaster Horus' fall to the corrupting influence of Chaos. He had been there as the Luna Wolves were corrupted from within. He was there at Istvaan III when brother turned on brother. He had endured the Siege of Terra, and he knew Saint Euphrati, the first of the Imperial Saints, as a friend.And he had been there the day the Emperor slew Horus. After revealing all, he then wheezed out his last breath and his heart stopped. Following Veritus' death, Wienand mourned the passing of her former rival, honouring him as probably the oldest man still living within the Imperium. She then made her way to Titan and met Janus, before returning back to Terra to work alongside Vangorich as his advisor.Due to his extended longevity and role as one of the Inquisition's founding members, Sindermann possessed a vast trove of knowledge about some of the greatest secrets of the Imperium of Man, which included the creation of the Daemon-hunting Grey Knights Chapter and their hidden citadel on Titan, the location of the lost Primarch Vulkan and the location of the last surviving members of the Silent Sisterhood.