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]
A Hell Talon is a single model. It is equipped with a helstorm cannon, a twin lascannon and a cluster of pyrax incendiary bombs.
The Hell Talon is the Chaos Space Marines' heavy fighter-bomber. Like the Hell Blade, it is made by the heretical Forge World of Xana from souls, flesh, metal, and daemons (or so the Imperium surmises -- considering that they disintegrate on destruction, it's hard to be sure). You'd think the Imperium would send a Kill Ship to destroy Xana (and any other Chaos Forge World they know of). But no, that wouldn't be grimdark enough and, additionally, most Dark Mechanicum Forge Worlds are basically daemon worlds, which give zero fucks about Exterminatus.