The precise Founding in which the Blood Ravens were created is unknown; their own chapter histories only begin in early M37, though other Imperial records contain some small references to the Chapter proving their existence before then. It is important to note that the Blood Ravens' histories are completely absent before the M37 date; they are not just spotty or fragmentary records. As a result, the Astartes of the Chapter know absolutely nothing about their origins, including having no knowledge of their primogenitor legion or primarch. This absence of information about a primarch has resulted in the Blood Ravens focusing their spiritual reverence on the Emperor. However, they do have one particular mytho-historical figure of import in the form of Azariah Vidya, known as the Great Father of the Blood Ravens.[2d]
In a game of Warhammer 40,000, a Xiphon pattern Interceptor is available for use with Space Marines, Space Wolves, Dark Angels, Blood Angels and Grey Knights Faction detachments as a Fast Attack choice where appropriate. The Xiphon Pattern Interceptor, or simply Xiphon Interceptor, is a void and atmospheric flight-capable fighter craft once used by the Space Marine Legions of old. The Xiphon Interceptor was widely used by the Legiones Astartes during the early days of the Great Crusade, before falling out of regular service and seeing a resurgence in general use during the Horus Heresy due to shortages of available combat aircraft.