The Nemean — also called the Nemean Reaver, the Scarred Master, and the Gloaming Slayer — was a member of the Dark Angels Legion. He was the First Lord of a Blackshields warband called the Dark Brotherhood during the Horus Heresy before joining the Knights-Errant.

The Nemean went on to serve Malcador as a Knight-Errant, supposedly fighting and dying on the walls of the Imperial Palace during the Siege of Terra. However it is possible he became Epimetheus, as the individual is a Dark Angel who admits to never having a true name.