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The Howling

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The Howling was an event in 401.M34. Black Templar Space Marines ended the Catelexis Heresy by executing the Cacodominus, an alien cyborg whose formidable psychic presence allowed it to control the populace of 1,300 planetary systems. However, the Cacodominus's death scream echoed and amplified through the Warp, burning out the minds of a billion astropaths and distorting the signal of the Astronomican. Millions upon millions of ships were lost in the resulting upheaval and entire Sub-sectors slid into barbarism without the Adeptus Terra to guide them.[1]

Some Imperium scholars speculated, that this psychic catastrophe could destroy all of the Black Templars Librarians so this Space Marine Chapter never have them since that time.[2]