The Shadowmasters or '''Mor Deythan''' were a unit of Raven Guard during the [[Great Crusade]] and [[Horus Heresy]]. They were ordinary battle-brothers who had the ability of [[Corax|their primarch]]'s ability to '''Shadow-walk'''. It was a quirk of the gene-seed in a few [[Deliverance|Deliverancian]] born Raven Guard that had more than just the standard gene code. The Mor Deythan acted as a elite stealth team and saboteurs and comunicated through '''Stalk-Argot''' while working in concert with the rest of the legion. The Shadowmasters preformed flanking maneuvers and sabotaged columns of rouge [[Skitarii]] on [[Constinax]]. {{Fn|20a}}