"No certain record holds the true name of the Blackshield Reaver Lord who became known throughout the Pale Stars as the Nemean Reaver -or simply the Nemean. It is generally held that he was once an officer of the 1st Legion -the Dark Angels- though this is far from certain. An unconfirmed rumour that attached itself to this figure pointed the Nemean as the survivor of the Rangdan Xenocides, the apocalyptic conflict that saw the nascent Imperium threatened with the destruction and he had already entered the legends of the Legiones Astartes long before the heresy.
Whether true or not, that rumour ascribed the Nemean Reaver the attributes of a veteran of this dark and terrible conflict, and speaks to the ruthless and inhuman reputation this Blackshield commander had achieved in the brief span of years that formed the Horus Heresy's middle phase, known post-commonly as the Age of Darkness.
Evidence suggests that after the Pale Star conflict, the Nemean Reaver, or at least a figure claiming that name, would in the later years of the war come to serve Malcador the Sigilite, a duty that culminate upon the walls of Terra at the very climax of the Horus Heresy."