'''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 as well as seventeen [[Dreadblade Knight]]s.{{Fn|3}} 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-sector]]s slid into barbarism without the [[Adeptus Terra]] to guide them.{{Fn|1}}

[[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 as well as seventeen [[Dreadblade Knight]]s.{{Fn|3}} However, the Cacodominus's death scream echoed and amplified through the [[Warp]], burning out the minds of a billion [[astropath]]s and distorting the signal of the [[Astronomican]]. Millions upon millions of ships were lost in the resulting upheaval and entire [[sub-sector]]s slid into barbarism without the [[Adeptus Terra]] to guide them.{{Fn|1}} Some [[Imperial scholar]]s have speculated that this psychic catastrophe could have destroyed all of the [[Black Templars]]' [[Librarian]]s; this would explain why the [[chapter]] has not had any since that time.{{Fn|2}}