Babi Ngepet is a boar or swine demon in Javanese mythology.^[1][2][3] According to the local myth, the creature is believed to be the manifestation of a person that practicing pesugihan babi black magic. Pesugihan is derived from Javanese word sugih means "rich". It is a kind of magic to help people to become rich instantly, but in exchange he or she must sacrifice something, in this case they must sacrifice their humanity; allowed themself to be transformed as a boar for a period of time, or some believed that they allowed themself to be possessed by a boar demon. The trans human-animal transformation is similar to shapeshifting or werewolf concept in the west.
Some of the myths told about a man in black robes covering his body before miraculously turning into this creature. The method is after the transformation the boar demon roaming around the village and scratching its body against the wall, door, cupboard, or furniture. Magically the belongings of the villagers, such as money, gold, and jewellery will be disappeared and magically carried away by the Babi Ngepet. If the mission went successful, when the Babi Ngepet safely returned home and transformed back into their human form, the black robes will filled with the stolen money or jewellery.
The person that practice Babi Ngepet black magic needs an assistance from other person. The assistant task is to stay home and guard the candle floating on a basin of water alight, while the Babi Ngepet is in its action. If the fire on the candle is shaking, fading or almost off, it is the sign that the Babi Ngepet is in danger caught in action by villagers or turned back into his human form. Because of this beliefs, Javanese villagers often chasing or even killing boar or pig wandering around the village in the night.