House Perdaxia was a formerly loyalist Imperial Knight household that repudiated its oath of loyalty to the Imperium of Man during the beginning of the Horus Heresy. There is little information on this formerly loyal knightly house in official Imperial records or from what world they originally hailed from. During the outbreak of the Horus Heresy, they answered the call of the mad Archmagos Inar Satarael, and willfully took part in the Invasion of Paramar V. Following Horus' defeat, it is assumed that House Perdaxia fled with the Traitor Legions into the hellish realm known as the Eye of Terror, where they presumably still exist to this day.