DEMONOLOGY - the study of demons or beliefs in demons. They can take many forms. Corporeal or non-corporeal. Humanoid, animalesque or something completely different.
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A king. Has estates in the East. Either has three heads or changes form. Frog, man and cat. Raucous and well-formed voice. Commands 66 legions. Teaches invisibility. Commander in chief of the armies of Hell. Grand Cross of the Order of the Fly.