It has been 2 years since I queried about this:
https://www.dakkadakka.com/dakkaforum/posts/list/704235.page
So there is an old 'map'of the realm of Chaos I found online that has a "Bad Moon" in it, seemingly hovering over the realm of Slaanesh. When I originally asked there didn't seem to be any real answer to what the Bad Moon was doing hanging around with our friends in the warp.
Now I don't usually take much notice of
AoS releases, but the resent Bad Moon Grotz release has got me interested in this subject again. Has there been any fluff update in 2 years to explain what The Bad Moon might be doing here?