Giant flies are more massive than the normal variety of flying insects and thus are Aerial Agility: Level III, though they can hover. They do retain a normal fly’s ability to react quickly and thus they can jump away from an attack in only 1 segment. This jumping defensive move is a backward springing leap which carries the giant fly 30-ft away and does not count as a retreat for purposes of a free attack.

These flies will rarely attack living prey unless he or she is covered with blood or has open wounds. They are also attracted to sweet food and drink, an abundance of these might garner the attention of this monster. Giant flies are more often encountered wherever there is an abundance of their preferred diet: carrion, rotting food, and malodorous refuse. Giant blow flies have a shiny metallic green or blue body covered with coarse black hair. Their large eyes are a dark orange colour.