The Demon Shintai allows a Kuei-jin to manifest his Inner Demon, transforming his flesh to resemble the servants of Yomi Wan. This Discipline is occasionally taught by evil spirits, in exchange for the character's service in the material world. Cathayans who assume their demon form too often are likely to attract the notice of the Yama Kings. Each Demon form is unique and depends on the P'o of the user, with the user gaining more demonic attributes as their level of mastery increases.