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'''The Beheading''' was an attempted coup of the [[High Lords of Terra]] in 546.[[M32]] by [[Drakan Vangorich]], the [[Grand Master of Assassins]].^{{Fn|1}}

For reasons still unknown, in 546.[[M32]] Drakan would act against the [[High Lords of Terra]]. Deploying his elite [[Officio Assassinorum|assassins]], the High Lords were slain to a man. A [[Space Marine]] strike force drawing from the [[Halo Brethren]], [[Sable Swords]], and [[Imperial Fists]] Chapters was scrambled to stop Vangorich. Storming the Assassinorum Temple on [[Terra]], the force was assailed by a hundred [[Eversor Assassin]]s. A sole Space Marine survived to reach Vangorich and slay the mad Grand Master with his [[Bolt Pistol]]. Afterwards, the Imperium descended into a period of anarchy.^{{Fn|1}}

*^{{Endn|1}}: [[Warhammer 40,000 5th Edition Rulebook]] p. 124