House Atrax was a Traitor Imperial Knight House that was forced to repudiate its oaths to the Emperor of Mankind and followed the Warmaster Horus into the service of the Ruinous Powers during the Horus Heresy. Founded sometime during the Age of Strife and rediscovered during the Great Crusade by the dour Mechanicum Tech-adepts of the Forge World of Cyclothrathe in the latter 30th Millennium, this unfortunate Knight House was forced into indentured servitude in accordance with the Sidon Protocols. This complex web of obligation and duty bound both House and Forge in a dangerous accord, whose tangled precepts often times easily led to the loss of any semblance of independence for a Knight Household that failed to uphold the protocols. These unfortunate circumstances were what led to House At