Empire Cave is notable for being the endemic stomping grounds of the Empire Cave Pseudoscorpion, the population of these arachnids being so small and isolated as to be primarily threatened by intrepid explorers, foolhardy party-goers, and psychedelic nomads looking for a "trip."
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According to Sisters of the Extreme: Women Writing on the Drug Experience, Gracie's name was chosen in homage to Gracie Allen, Grace Slick, and the "gratuitous grace" that Aldous Huxley found in the psychedelic experience.