If by chaos star you are referring to the common symbol of chaos that looks like 8 arrows originating from a central point, that symbol was invented by Michael Moorcock in his Elric series c. 1960. It represents a Cartesian coordinate system in four dimensions, implying unlimited freedom of movement.
Warhammer fantasy battle first came out in 1983, long after the symbol was known to gamers and fantasy fans. It became more popular in the early 90's with the release of the hero heavy fourth edition.
What we now call Chaos Magick came about around the same time, late 70's and early 80's. The basic concepts of magical paradigms and creative ritualism were present, but it wasn't called "chaos" yet. That seems to have come about when the need for a fundamentally agnostic "religion" to fuel thaumaturgic spells led many magicians to Discordianism.
While there was always an overlap between magicians and fans of high fantasy, they started converging in the mid to late 90's, as some magicians started deliberately using pop culture paradigms in magic. Comic book artist Grant Morrison, for example, has claimed his Invisibles series is a massive AOS style sigil.
Never doubt that a small group of thoughtful, committed citizens can change the world. Indeed, it is the only thing that ever has. --Margaret Mead
There's a mugged leprechaun at the end of every rainbow. --shortpacked.com
A good magician never reveals how a trick is done.
An evil magician never leaves any evidence that there was a trick in the first place.
---Master Payne (Phil Foglio's Girl Genius)
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