Crow fly

Crow flies are native to the Shadow swamp on Paratorna. Its equal in size to a crow, hence the name. It is not immediately dangerous to sentients, but people who venture into the swamp soon find themselves surrounded by increasing numbers of the these large insects. They buzz and buzz around the intruder, with loudness and persistence. After a few days of this, people tend to go mad. Their minds broken, they often succumb to the swamp, and the flies, finally, get to feast on their corpses.