26-30 Age of Strife Human worlds ripped apart by civil wars, revolts, alien predation and invasion. Human psykers and other mutants dominate some . worlds and these rapidly fall prey to warp-creatures. Humanity is on the brink of destruction.

30-present Age of Imperium Earth is conquered by the Emperor and enters an alliance with the Mechan-icum of Mars. Finally the warp-storms abate and interstellar travel is possible again. The Emperor builds the Astro-nomican and creates the Space Marine Legions. Human worlds reunited by the Emperor in a Great Crusade that lasts for two hundred years.