Long Time CauldronMUX Users Help Wanted

I’m writing a screenplay scene set in Hell. I’m wanting to specify that it’s in the “grey mists”, as a tip of the hat to the old MUX. But my spell checker keeps flagging this. Am I right in remembering that it was the “grey mists”, or was it actually the “gray mists” as my spell checker insists?

Also, does any long-time user have the etymology of the term? Did it come from an old role-playing or computer game or such? Thanks.

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