According to local myth, the creature is believed to be the manifestation of a person practising pesugihan babi black magic. Pesugihan is derived from the Javanese word sugih meaning "rich". It is a kind of magic to help people become rich instantly, but in exchange he or she must sacrifice something, in this case they must sacrifice their humanity; allow themselves to be transformed into a boar for a period of time, or that they allow themselves to be possessed by a boar demon. The human-animal transformation is similar to shapeshifting or the werewolf concept in the West.
Some of the myths told about a man enveloped in black robes before miraculously turning into this creature. After the transformation, the demon boar roams around the village, scratching its body against the wall, door, cupboard, or furniture. Magically the belongings of the villagers, such as money, gold, and jewellery will disappear and magically carried away by the Babi Ngepet. If the mission was successful, by the time Babi Ngepet safely returns home and transforms back into human form, the black robes will be filled with the stolen money or jewellery.
The person that practices Babi Ngepet black magic needs assistance from another person. The assistant's task is to stay home and guard the lit candle floating on a basin of water, while the Babi Ngepet is in action. If the fire on the candle is shaking, fading or almost out, it is the sign that the Babi Ngepet is in danger, caught in the act by villagers, or turned back into his human form. Because of this belief, Javanese villagers often chase or even kill any boar or pig wandering around the village at night.
The skeptical view is that it was probably a traditional way to explain the unexplainable loss of fortune or a mysterious theft in the village, by blaming the wild boar roaming the village in the night. Or probably it was a means of traditional pest-control; to get rid of wild boar from eating and destroying rice fields or barns. The association of boar or pig with magic concerning fortune probably originated from Javanese pre-Islamic and pre-Hindu-Buddhist beliefs that associate the boar or pig with domestic richness, fortune and prosperity, similar to its connections with Celengan, which means piggy bank in Javanese. The word Celengan is derived from word Celeng which means boar.
- Sunyoto, Agus (2004). Sang pembaharu: perjuangan dan ajaran Syaikh Siti Jenar. LKiS Pelangi Aksara. ISBN 978-979-3381-55-8.
- Wachtel, Paul Spencer (1988). Soul of the tiger: searching for nature's answers in exotic Southeast Asia. Doubleday. p. 138. ISBN 978-0-385-24225-7.
- Asian Folklore Institute, Society for Asian Folklore, JSTOR (Organization), American Theological Library Association (Jul 20, 2010). Asian folklore studies, Volume 65, Issues 1-2. Asian Folklore Institute.
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