In 999.M37, Abaddon the Despoiler launched the 8th Black Crusade of the Forces of Chaos out of the Eye of Terror into Imperial space. During this incursion into the Realms of Man, Abaddon completed a complex ritual of death known as the Skullgather in the name of Tzeentch, the Changer of Ways. On worlds throughout the Segmentum Obscurus, Imperial citizens were slaughtered in precise numbers and esoteric rituals. Only when the Inquisition finally broke the code of damnation was the Imperium able to bring an end to the Black Legion's rampage across the Segmentum in time with these mysterious attacks, but not before countless worlds had been saturated in death.