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The Kudan was a ancient yōkai from Japanese folklore, commonly depicted as either cows with human faces, or humans with cow heads. It was a monster that foretold disaster being seen only before a great war would have started and dying when it ended.

History in Devilman Lady[]

The Kudan was used as an example by Seiji Hayami when talking to Jun Fudo about the ancient Grumech god of war Vlava who had a similar idea to the Kudan, as well as appearance.