Onmyouji are practitioners of a traditional Japanese esoteric cosmology known as Onmyōdō, which combines elements of Shinto, Buddhism, and Taoism. They were historically responsible for various tasks, including divination, exorcism, and the management of spiritual entities. Onmyouji often used tools like yin-yang symbols and five elements to interpret the world around them. In ancient Japan, onmyouji held significant roles in the imperial court, advising rulers on auspicious dates and spiritual matters. Famous figures, such as Abe no Seimei, are often depicted in folklore and popular culture, highlighting their mystical abilities and connection to the supernatural.