Merir Astelan - Imprisonment: The Dark Angels sent Interrogator-Chaplain Boreas to investigate, who ended up fighting Tharsis' soldiers until Astelan realised who had come to the planet he now ruled. Astelan gave the order to stand down and allowed the Interrogator-Chaplain and his Deathwing retinue into his command bunker, where he was immediately taken into their custody once identified as one of the Fallen and transported off-world to the Tower of Angels on The Rock for interrogation.Over the span of fifteen solar days, Boreas and his Librarian assistant Samiel pried at Astelan's mind with pain, torment, psychic abilities, and questions designed to undermine Astelan's view of the events that occurred, trying to get him to admit his sins and repent. Astelan struggled mightily against their ministrations and survived, explaining much about the past of the Chapter and the Old Legion before the Heresy.He revealed that it was his order that set Caliban's defence batteries ablaze against Lion El'Jonson's fleet when it returned, and he revealed that it was his voice that joined with Luther when the Dark Angels on Caliban were uncertain that they were being led in the right direction while watching over the planet. But most damning of all in the eyes of the Dark Angels of the 41st Millennium, Astelan admitted that his intent had been to kill the Dark Angels' Primarch, Lion El'Jonson, as he believed his oaths to the Emperor and the Emperor-sworn Terran Astartes under his command were incompatible with the motives of the Lion, and that he was loyal to the Emperor first and by a wide margin; therefore the Lion had to be removed as a threat to the Emperor's will.Aghast at the Fallen Angel's confession of foul treachery, especially seeking the death of the I Legion's Primarch, Boreas scorned Astelan's essential assertion that the ruination of the Great Crusade was the fault of the Primarchs and that the Space Marine Legions would have been better off remaining under the singular and personal command of the Emperor. He accused Astelan of arrogance and jealousy that had been abetted by the narcissistic rantings of Luther.But Astelan insisted that he had never fallen to Chaos and remained true to the Emperor always, and argued in turn that the Dark Angels Chapter and their Successors of the 41st Millennium were the true creatures of shadow and darkness, always hiding their motivations from the rest of the Imperium and betraying their allies in service to their own obsessive quest for redemption. Finally, he told his interrogators of how the Lion had opened fire upon Caliban with a massive orbital bomardment, his descent to the Tower of Angels to duel with Luther personally, and the apparent Warp Storm that had spirited Luther, Astelan and the other Fallen away.Astelan's final claims about their Primarch's uncertain motives during the Heresy were the ones Boreas found the most appalling. For the Fallen had noted correctly that in the Imperial records of the time, the Lion had been unusually slow in reaching Terra after receiving the distress call from Malcador the Sigillite, slow to the point where the Dark Angels under his command had never arrived in time to take part in the Battle of Terra.Astelan laid only scorn upon Boreas' version of those events, in which the Lion had been waylaid by the ongoing machinations of Horus and the Traitor Legions and so was simply held up from reaching the Throneworld. Astelan laughed darkly as he revealed that the Lion -- a peerless strategist never defeated in battle -- was not late to Terra. He had simply been stalling in order to see who would win the great conflict and then intended to throw his forces behind the victor.After his questioning, Astelan was taken from his interrogation chamber by Sapphon, the Grand Master of Chaplains, and placed in a cell adjacent to the still-living Luther, the greatest of the Fallen Angels, within the deepest catacombs of The Rock, the Dark Angels' mobile fortress-monastery.