Nasu (Zoroastrianism)

In Zoroastrianism, Nasu (also spelled Nasa, Nasu.druj, or Druj-i Nasu) refers to the corpse demon, a female spirit associated with death and decay. She is believed to be a powerful and malignant force that contaminates anything that comes into contact with a corpse, rendering it impure and spiritually dangerous.

The Nasu is considered a manifestation of Druj, the principle of falsehood, evil, and disorder in the Zoroastrian cosmos. She is depicted as a repulsive fly that emerges from the dead body, symbolizing the corruption and disintegration brought about by death. Her presence spreads pollution, affecting not only the immediate surroundings but also the spiritual well-being of individuals who come into contact with the contaminated area.

A central aspect of Zoroastrian funerary rites is the prevention of Nasu's influence. Elaborate rituals are performed to protect the living from contamination, and methods such as exposure of the dead to vultures (a practice known as dokhma, or Tower of Silence) are traditionally employed to minimize the contact of the corpse with the earth, fire, and water, which are considered sacred elements. Through these practices, Zoroastrians aim to limit the spread of decay and prevent the dominion of the Nasu.

The concept of Nasu highlights the Zoroastrian emphasis on purity and the constant struggle between good and evil, light and darkness. The rituals and beliefs surrounding death are designed to maintain cosmic order and protect the living from the corrupting influence of evil represented by the corpse demon.