The Onmyo no Kami was the director of the bureau which was staffed by Onmyoji (yin and yang practitioners) who performed spells based on Onmyodo (way of Yin and Yang; an occult divination system based on the Taoist theory of the five elements).
長官は陰陽頭で、陰陽道に基づく呪術を行う陰陽師がいる。