Wow. What an eerie response
Specifically, I'm referring to the Lost City which serves as the prison/demesne/bachelor pad of the Tattered King, who is served by the Dancers of said Lost City. The city that goes nameless in the text, but bears a striking resemblance to Carcosa
In my campaign, I have the Tattered King as one of the gods of the former Thule empire. I haven't decided how he got imprisoned in the Lost City yet, but Marcus Freund is combing the uncovered Thule ruins in Russia, searching for a way to release him. The Opus Angelorum believes the Tattered King is actually the Apollyon/Abaddon of biblical myth, and that his release from the "Pit" will bring about the Apocalypse.
Fortunately, most of this won't come into play until much later in the campaign, so I'll have time to change things up if the canon version of events turns out to be more interesting...