Druj Nasu

The Daeva Nasu abides over corpse matter. In the Material Plane, Nasu takes the form of a fly, and is the manifestation of the decay and contamination of corpses. When a death occurs, Nasu is drawn along with other evil spirits to inhabit the corpse and act as a catalyst for its decomposition. Nasu is commonly considered the greatest polluter of Ahura Mazda's world.