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In 546.[[M32]] after the disastrous [[War of the Beast]], the [[High Lords of Terra]] [[The Beheading|were slain to a man]] by the Grand Master of the Officio, [[Drakan Vangorich]]. A [[Space Marine]] strike force drawing from the [[Halo Brethren]], [[Sable Swords]], and [[Imperial Fists]] [[Chapter]]s under [[Lord Commander]] [[Maximus Thane]] was scrambled to stop Vangorich. Storming the [[Assassinorum Temple]] on [[Terra]], the force was assailed by a hundred [[Eversor Assassin]]s. Only Thane survived to reach Vangorich and slay the mad Grand Master. Afterwards, the Imperium descended into a period of anarchy.{{Fn|6}}
During the [[Age of Apostasy]], the Officio itself became afflicted by the general corruption of the Imperium, and certain high-ranking members of the Office utilised the assassins for [[Goge Vandire]]'s own ends. During Vandire's purges, powerful individuals and even the Officio's Grand Master became victims of the assassins. The war within the Officio became known as the [[Wars of Vindication]]. Following the Apostasy, it was deemed wise to reorganise the Office, one change being that only the Senate could order an assassination. A section of the [[Inquisition]], the [[Ordo Sicarius]], was created to monitor and control the Officio Assassinorum from that date on.{{Fn|17}}Since then, the Ordo has infiltrated the Officio Assassinorum with [[Assassin-Inquisitor]] spies, who pass information to their [[Inquisitor]] masters. The Assassin-Inquisitors were created by the Ordo Sicarius' founder, Inquisitor [[Jaeger]], who used their information to foil several plots began by elements of the Assassinorum. This included two attempts to assassinate the [[High Lords of Terra]] and the attempt to assassinate a [[Radical]] Inquisitor who had been dealing with [[Ork]]s in the [[Lamina Sector]].{{Fn|5b}}
It was through intelligence gathered by the Officio Assassinorum that the Adeptus Astartes learnt that the [[Sorceror]] [[Ygethmor]] intended to claim the world of [[Medusa V]] in a [[Warp Storm]].{{Fn|7b}} During the [[13th Black Crusade]], an assassin team was deployed to eliminate the Sorceror amongst other notable targets. It was known that at least seven agents of the Assassinorum failed in the attempt on Ygethmor's life.{{Fn|7a}}
