The ''chang'' ( zh, t=倀, s=伥) is a kind of ghost in ancient
Chinese legend
Chinese mythology () is mythology that has been passed down in oral form or recorded in literature in the geographic area now known as Greater China. Chinese mythology includes many varied myths from regional and cultural traditions.
Much of t ...
. According to the legends, people devoured by tigers turn into ghosts, who then help tigers devour other people. The idioms " zh, t=為虎作倀, s=为虎作伥" (to play the jackal to the tiger; that is, to help a villain do evil) and " zh, t=狼無狽不行，虎無倀不噬, s=狼无狈不行，虎无伥不噬" (wolves can't go without ''
bei'', tigers can't bite without ''chang''; that is, without the help of others, villains can only do so much) arise from this.
It is described in the "Ma Zheng" chapter of the "Legend" quoted by Tang Peizheng in the Song Dynasty "Taiping Guang Ji".
[http://www.cgcfd.com.cn/jqjd_Show.asp?ArticleID=35—Ghost City Fengdu—Hometown of Chinese Divine Comedy]
References
Chinese ghosts
{{China-myth-stub