豆腐块故事，没有细说呢

Black Templar Space Marines end the Catelexis Heresy by executing the Cacodominus, an alien cyborg whose formidable psychic presence allowed it to control the population of thirteen hundred planetary systems. The Cacodominus' death scream echoes and amplifies through the Warp, burning out the minds of a billion astropaths and distorting the signal of the Astronomican. Millions upon millions of ships are lost in the resulting upheavel and entire sub-sectors slide into barbarism without the dictates of the Adeptus Terra to guide them.
Warhammer 40000 Rulebook 5th
After learning of the existence of the Imperium of Man, the colossal alien cyborg known as the Cacodominus uses its psychic abilities to secure the services of seventeen wandering Dreadblades.
Each of the Knights is charged with a different mission–one is sent to find a sunless planet on which an ancient technological marvel is buried, another is tasked with rounding up and butchering every member of a rare alien species called the Axlo, while another is given the esoteric duty of protecting the time stream against the Tzeentchian Daemon Kairos Fateweaver.
Meanwhile, the Cacodominus itself conquers hundreds of systems. When the creature is finally slain by the massed armies of the Legio Cybernetica and Black Templars, its dying psychic scream echoes across the galaxy, even distorting the guiding light of the Astronomican.
But the seventeen Dreadblades who serve it make no effort to seek revenge. Each had been commanded to pursue the individual task they had been given, come what may, and even the death of their liege is of little concern so long as the Cacodominus’ will is eventually fulfilled.
Codex: Chaos Knights 8th

5版的时候的豆腐块，8版的时候又给它补了一段更诡秘的细节:
黑色圣殿星际战士处决了恶主，结束了卡特莱西斯叛乱。恶主是一个外星机器人，其强大的精神力量使其能够控制一千三百个行星系统的人口。恶主的死亡尖叫声在亚空间中回荡和放大，烧毁了十亿星语者的思想，扭曲了星炬的信号。数以百万计的船只在由此产生的动乱中沉没，整个子星区在没有泰拉修会的指导下陷入野蛮状态。
Rulebook 5th
在得知人类帝国的存在后，被称为恶主的巨大外星机器人使用其通灵能力来获得十七名流浪恐惧之刃的服务。
每个骑士都肩负着不同的任务——一个被派去寻找一颗埋藏着古代科技奇迹的无太阳星球，另一个被派去围捕和屠杀一种名为 Axlo 的稀有外星物种的每一名成员，而还有一个被赋予了保护时间流免受奸奇麾下的恶魔织命者卡洛斯侵害的神秘职责。
与此同时，恶主本身也征服了数百个恒星系。当这个生物最终被人类帝国以及黑色圣堂大军杀死时，它临死前的心灵尖叫声回荡在整个星系，甚至扭曲了星炬的指引之光。
但为它服务的十七名恐惧之刃并未试图寻求复仇。他们每个人都奉命完成各自被赋予的任务，无论发生什么，只要恶主的意志最终得以实现，他们的君主的死亡对他们来说都无关紧要。
Codex: Chaos Knights 8th

帮楼上老哥补充一下原文
After learning of the existence of the Imperium of Man, the colossal alien cyborg known as the Cacodominus uses its psychic abilities to secure the services of seventeen wandering Dreadblades. Each of the Knights is charged with a different mission – one is sent to find a sunless planet on which an ancient technological marvel is buried, another is tasked with rounding up and butchering every member of a rare alien species called the Axlo, while another is given the esoteric duty of protecting the time stream against the Tzeentchian Daemon Kairos Fateweaver. Meanwhile, the Cacodominus itself conquers hundreds of systems. When the creature is finally slain by the massed armies of the Legio Cybernetica and Black Templars, its dying psychic scream echoes across the galaxy, even distorting the guiding light of the Astronomican. But the seventeen Dreadblades who serve it make no effort to seek revenge. Each had been commanded to pursue the individual task they had been given, come what may, and even the death of their liege is of little concern so long as the Cacodominus’ will is eventually fulfilled.