Here we go, my original Chaos Marine Army back in the day when Chapter Approved came out of White Dwarf and most of an entire magazine was dedicated to the Nostramo and their dark Primarch. From the moment I read that magazine I was in love with the Nightlords all those years ago.
via the Warhammer Community
Even before the Horus Heresy, the Night Lords were cynical, nihilistic killers. Drawn from the criminal population of the night-shrouded world of Nostramo, the VIII Legion became notorious for committing brutal atrocities and turning fear itself into a weapon. Since the Horus Heresy, they have become raiders and pirates, fighting to please their dark whims and generally seeing Chaos as a tool to be exploited rather than something worthy of worship.