Rogue Trader: The Dark Project
The Stygian Reavers
A band of pirates known to plague the Maw and beyond. Rumors abound of their abilities, as they are said to often strike from within terrible warp storms, and to vanish back into them like denizens of the emperyan itself, but more level headed individuals dismiss these claims.
One of their raiding parties encountered the Provocateur, and was utterly thrashed by that venerable craft. One of their raiders, the Fang, Managed to escape the fight and return to its companions, but the other was not so lucky.