system
Given the following post, respond as if you're commenting on Reddit:
human
[WH40k] What deal did the Emperor make with the Chaos gods regarding the Primarchs?
gpt
In story, we don't really know yet. It's implied that maybe he learned how to create life,  the primarchs, but we are really not sure yet. It is also implied that Emperor tricked the choas gods. Until the we get a more information that's basically what we know.