Extra Mythology
Persian Myth - Zahhak the Demon King (9x1)
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Zahhak was not always a demon king--but, deceived by a young man named Iblis, he was motivated to slay his father to obtain world power. His pride would cause him to turn into a monstrous demon king, with serpents on his shoulders that fed on the Arabian people, for a thousand years... until Feraydun showed up...