Past the Edge of Darkness
Thousands of years ago the great forces of the space marines led by the children of the emperor, spread out amongst the stars claiming the known galaxy for the Imperium for man. The chaos gods grew discontent with this new age of discovery and providence for humans and began a plan to over throw humans once and for all. The plan came to fruition when Horus the war-master, first son of the Emperor, was turned to the forces of the ruinous powers with promises of limitless ability and control over the galaxy. When Horus secretly changed allegiances so did his chapter of thousands of Space Marines and 6 other entire chapters also followed suit believing the lies Horus was spreading about the God Emperor. Soon a great civil war broke out amongst the remaining 6 chapters of loyal marines and the 7 chapters of corrupted marines. The ensuing war ripped the Imperium apart and almost destroyed mankind. In the final battle the Emperor struck down Horus with his own blade but was mortally wounded himself. He was rushed to the Golden Throne where he has ruled from and been entombed since. The remaining traitor legions fled back into the Eye of Terror where they have launched black crusades continuously trying to finish the job they started millennia ago. One of the inquisition’s jobs is to root out and destroy any who have been influenced by chaos in order to avoid another war like the great civil war because the forces of mankind would not survive.