As a historical figure he is identified as Zhao Xuan-tan (Chao Hsüan-t'an), "General Zhao of the Dark Terrace", from the Qin Dynasty. He attained enlightenment on top of a mountain. He also assisted Zhang Dao-ling on his search for the life-prolonging elixir.
Cai-shen is usually portrayed riding on a black tiger. He has a black face and a thick moustache. On his head he wears a cap made of iron and he holds a weapon, also made of iron.
