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Sometime after the creation of the Great Rift, the ambitious Black Legion Chaos Lord Hadrexus led a a sizable contingent of Black Legionnaires in an invasion of the world. His forces easily swept aside Dakhorth's defending Imperial Guard Regiments and advanced to claim the main target of his invasion: the ancient Xenos ruin, known as the Echovault. Before he could reach the Echovault, however, Hadrexus' forces were attacked by the Adeptus Custodes Dread Host, who seized the passage to the Xenos ruin. Though dozens of Custodians fell during the fighting, they killed Hadrexus and devastated the Black Legion invaders, which sends the surviving Legionaries fleeing back into the Warp. As for the Echovault, it is left undisturbed and a permanent garrison of Custodian Wardens, are left on Dakhorth to watch over it.