The practice of divination or fortune-telling through communication with or invocation of demons.
From demon + -mancy (from Greek manteia meaning 'divination'). The term combines the Greek tradition of various divination practices (-mancy) with demons specifically, suggesting attempts to gain knowledge through supernatural entities.
Like necromancy (talking to the dead) or pyromancy (reading fire), demonomancy represents humanity's historical obsession with using supernatural shortcuts to predict the future—our ancestors basically wanted a magic search engine!
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