The Long War
While the events of the Heresy seem ancient and often simply myths to the citizens of the Imperium, due to the slower passage of time in the Warp they are still fresh in the minds of those Chaos Space Marines who now dwell within the Eye of Terror. The centuries have seen most Legions tear themselves apart in civil fighting, its fellows becoming disparate warlords, mad killers, possessed by Daemons, or the servants of the Ruinous Powers who are more devoted to the Great Game than the struggle against the Emperor's domain. It is in this world of ever-changing delirium and destruction that the Chaos Space Marines who have retained their sanity and kept the influences of the Warp at bay have done so by keeping their sense of purpose by continuing the Long War and attacking the Imperium from the Eye. Indeed, the Long War can be said to be the only thing capable of uniting many of the disparate Warbands of Chaos Space Marines into a cohesive fighting force, most notably in the Black Crusades of Abaddon the Despoiler.
Many Chaos Space Marines consider the Primarchs once loyal to Horus to have given up on The Long War, failing their cause and instead achieving Daemonhood to wage war in the Great Game in the Warp.
- 1: Codex: Chaos Space Marines (4th Edition), pg. 17
- 2: Blood Reaver (Novel), [Needs Citation], pg. 257