Murder

A favorite pastime of Rogues, Orcs, Khorne, and basically anything else you meet on a tabletop that isn't trying to sell your tools for more murder.

The Planet Murder

As seen in Horus Rising, Murder was a planet encountered by the expedition fleet commanded by Horus Lupercal himself. Initially the Blood Angels made planetfall on Murder, and the natives completely annihilated an entire company of the astartes. They unfortunately succeeded in sending out a distress signal, which the Emperor's Children; commanded by a certain sick fuck responded to. When the natives wiped out half of a company of said Emperor's Children, they too turned the wheels around and sent out their OWN distress beacon.

And this is where the Sons of Horus came in. They found a ring of abandoned space stations surrounding the planet, all of which were broadcasting a strange signal composed entirely of heavenly singing, in addition there were also multiple ships in various stages of shredded debris in orbit. The Sons of Horus discovered the distress beacon of the Emperor's Children, and thus sent down a PROPER invasion force to rescue them. With the pink-retards secured, Horus had just ordered the complete destruction of Murder, and for the Mecharachnids of such a world to be purged to the last.