 Specifically, it deals with a plan by a secret Imperial organisation, the , to eliminate Horus; an "Execution Force" consisting of operatives from all of the Officio's disciplines, and led by top-rated sniper Eristede Kell, is tasked with the mission.There have been several previous unsuccessful attempts against Horus' life, and this gives a high-ranking officer of the Traitor Word Bearers Legion the idea to field a nemesis weapon of his own