

Watch / listen to “If The Emperor had a Text To Speech.” It is a really good non canon primer for the world. It wasn’t made by GW, and so the creators abandoned that series a few years ago when GW changed their licence agreement.
It is about 90% canon, as in, if the Emperor could routinely talk to anyone, he would start unfucking The Imperium, post haste. The current Imperium is nothing like what he was trying to make.




They also were on their way somewhere else, and the Emperor, and the imperium at large set up the Astronomicon, which is basically a giant beacon to the bugs that screams “there’s food here!”
Were it not for the imperium, that particular version of the milky way wouldn’t be nearly as fucked as it is, but it would still be pretty fucked because Slannesh would still have been born.