Fox Spirit

The fox spirit (狐狸精) or nine-tailed fox (九尾狐) is a mythical fox entity originating from Chinese mythology that is a common motif in East Asian mythology.

Dictionary
In East Asian folklore, foxes are depicted as a familiar spirit possessed of magic powers. These foxes are depicted as mischievous, usually tricking other people, with the ability to disguise themselves as a beautiful woman.

The fox spirit is an especially prolific shapeshifter, known variously as the húli jīng (fox spirit) in China, the kitsune (fox) in Japan, and the kumiho (nine-tailed fox) in Korea. Although the specifics of the tales vary, these fox spirits can usually shapeshift, often taking the form of beautiful young women who attempt to seduce men, whether for mere mischief or to consume their bodies or spirits.

Descriptions
Three hundred li farther east is Green-Hills Mountain, where much jade can be found on its south slope and green cinnabar on its north. There is a beast here whose form resembles a fox with nine tails. It makes a sound like a baby and is a man-eater. Whoever eats it will be protected against insect-poison (gu).

When a fox is fifty years old, it can transform itself into a woman; when a hundred years old, it becomes a beautiful female, or a spirit medium, or an adult male who has sexual intercourse with women. Such beings are able to know things at more than a thousand miles' distance; they can poison men by sorcery, or possess and bewilder them, so that they lose their memory and knowledge; and when a fox is thousand years old, it ascends to heaven and becomes a celestial fox.

Among the arts of the Way, there is a specific doctrine of the celestial fox. [The doctrine] says that the celestial fox has nine tails and a golden color. It serves in the Palace of the Sun and Moon and has its own fu (talisman) and a jiao ritual. It can transcend yin and yang.

Traditions
Since the beginning of the Tang, many commoners have worshiped fox spirits. They make offerings in their bedchambers to beg for their favor. The foxes share people's food and drink. They do not serve a single master. At the time there was a figure of speech saying, "Where there is no fox demon, no village can be established."