In addition, we have a weapon capable of dealing instant, unreversible death (as in, a weapon that destroys souls) in the hands of a character who kills at random. Explain how this is conducive to good RPing.

[quote=SillyGoy]
The Blood Ravens are mentioned in the codices and the books; their origins even hinted; their victory in Aurelia confirmed in the Space Marine game.I am simply glad I get to pick Kyras.
[/quote]

That does not explain how your character does not horribly violate GW canon. Sourcebooks trump video games.