Pishacha

The pishacha appears already in Vedic and epic Sanskrit literature, including the Ramayana and Mahabharata, as a distinct and lower class of spirit associated with darkness, cremation grounds, unclean places and the eating of raw or rotting human flesh, ranking it among the more feared beings in the wider bhuta-preta taxonomy rather than a merely mischievous or ambiguous ghost.

Some Puranic genealogies count the pishachas as a class of being created directly by Brahma or descended from Kashyapa, giving them a distinct mythological origin rather than treating every pishacha as a formerly human soul, which sets the type apart from the vetala and bhoot; in practice, though, popular and regional tradition often blurs the line and treats a pishacha as one possible fate of a person who died in a state of extreme impurity or violence. Classical Sanskrit drama and poetry occasionally used a language called Paishachi, said to be the tongue of the pishachas, as a literary device, and the Brihatkatha, an important lost Sanskrit story collection, was traditionally said to have been composed in it, giving the creature an unusual secondary life as a linguistic category alongside its mythological one.

Because pishachas are associated so consistently with cremation grounds, illness and misfortune, protective mantras and rites naming them by category appear throughout later Hindu ritual literature, including formulas meant to guard a household, a pregnant woman, or a sick person specifically against pishacha interference, distinct from the protections offered against bhoots or vetalas. Ayurvedic and folk medical traditions in some regions historically attributed specific forms of madness or wasting illness to pishacha affliction, which meant that treatment could involve ritual as well as herbal intervention, a pattern paralleled in many other cultures' folk explanations for illness with no obvious physical cause.

Encyclopedic treatments of Hinduism generally place the pishacha at the more thoroughly demonic end of the subtle-being spectrum, below the more neutral or ancestrally connected bhoot and preta, and closer in function to a predatory spirit whose danger is inherent rather than a matter of unresolved circumstance, though as with most of this taxonomy, regional oral tradition varies considerably in how sharply that line is drawn.