House Raven is a Loyalist Imperial Knight House aligned with the Adeptus Mechanicus. House Raven is the largest of the knightly houses, with many hundreds of Imperial Knights at its disposal. The heraldry of this ancient house proudly displays their allegiance to the Adeptus Mechanicus, for they have been allied to the Forge World of Metalica for over ten millennia. The bond between House Raven and their associated forge world is particularly strong and mutually beneficial -- Kolossi's Sacristans are highly trained and the strength of Legio Metalica Titan Legion is greatly bolstered by House Raven's knightly host.