>>95862995
>Just rewriting Chaos as an eldritch horror from beyond the dawn of time and also keeping all the events progressing normally like it wasn't looming in the Warp the whole time
The way the causality of the warp is played is consistent. Each chaos god has a defined birth, before those births the gods did not exist(at least not fully formed), but after the births the gods always existed, this changes things retroactively. Slaanesh did in fact not exist until the Eldar birthed them, and the warp was relatively quiet during that era. Now that Slaanesh exists they are able to influence the past though, and you'll get the story where slaanesh daemons could be locked up in a vault from the war in heaven. Causality in the immaterial hasn't changed, history is still history and the chaos gods can't change the facts as they are while at the same time we see bits of their influence in the past slip through, like peering into alternate histories.