Elements from Taoism, Buddhism, and traditional Chinese folk religion are all incorporated in the Chinese concept of Diyu(地獄), a mythological realm of the dead. A purgatory(煉獄)of sorts, Diyu is a maze of underground levels and chambers where souls atone(償いをする)for their earthly sins and prepare for reincarnation. According to some legends, Diyu has 18 levels, each of which is reserved for specific categories of offenders. For instance, wealthy men who do no good and waste food are ground into powder in Chamber of Grinding.