User blog comment:DirgeOfCerberus111/An Alternate Universe? Let the heresy begin!/@comment-3398633-20110830215310/@comment-3398633-20110831175057

Well Skynet, I mean the rogue AI of the men of Iron was defeated in a war that almost destroyed humanity. However, it was the warp storms that prevented travel that put the final nail in a coffin. Without space travel, the hive world that had become Terra couldn't sustain it's population, and without travel, troops couldn't be ferried to worlds that needed protection from daemons and Orks that were overruning human worlds in the chaos (Aahhhhh! Get it?). Anyway, it was then that humanity's empire fell. It was the Eldar's fault really, not Skynet's.