Editing Races of Warhammer 40k (section)

===Chaos Space Marines===
[[Chaos]] Space Marines are to the Space Marines what the Dark Eldar are to the Eldar, that is to say EVIL SPACE MARINES!

One day, over 10,000 years ago, the Primarch Horus and Warmaster of the Imperial fleet got into [[Heresy|some bad shit]] during The Great Crusade, being wounded by some weird weapon that put him into a coma wherein he was visited by the [[Chaos Gods]]. When he eventually decided he couldn't take the goddamn voices any more, he turned to Chaos and took about half the Imperial army with him - including half the Adeptus Mechanicus and their titan legions!

This was the Horus Heresy. They fought a big war, with the rebel marines fucking shit up all the way back to Terra. Sooo grimdark, but then the Emprah killed Horus (but not after Horus took a pretty sizeable chunk out of the Emperor). Since then, the Emperor has been down and out for the last 10,000 years in a persistent vegetative state while acting as a lighthouse, and his empire has really gone to shit (read the Horus Heresy, compare with today's Imperium). Every once in a while, [[Abaddon|they launch a Black Crusade that ends in failure]]... except for that last one! Sure, those 12 previous crusades were about toppling the Imperium as an overarching goal, but that's a bit of a stretch goal for each individual crusade. In the fluff, Abaddon accomplishes a few things each crusade that build up for the next one. 

The remaining CSM fled to the Eye of Terror wherein they adorned all their stuff with spikes, chains and severed heads while steadily mutating. They were also busy being a continuing pain in the ass running up the bulk of the Imperium's defense budget. Though a lot of them exist in scattered warbands, they tend to be a real nuisance by engaging in piracy, starting planetary/sector uprisings and just generally engaging in the usual terrorist shit except with genetically modified super soldiers bolstered by literal magic and these fucking things...