The Crawler Fly is a monster appearing in ObsCure, generated by genetic mutation of Mortifilia.
The Crawler Fly is a creature at the intersection between a fly and a plant pest; its size, however, are greatly increased. This creature has a mutation type 4, described by Herbert Friedman, or when a contaminated subject is left in a non-sterile environment is likely to come into contact with parasites or other small insects, which become part of the metamorphosis mixing their characters with human ones: the result is an abomination that has very little human.
You can see a specimen in the janitor room as he flees through an air duct after opening in two the man's body. The first encounter, which you can deal to, appear on the Cafeteria. This creature runs on ceilings quickly moving through the air ducts of the school and attacks with a prehensile proboscis capable of causing modest damage. His strongest attack, however, consists in grasping the prey by the neck through its prominence and lift it off the ground to smother it in that very reminiscent of a hanging. If the player is gripped by this attack it will be very hard to remove, especially if it can not count on the help of a companion.
The Mortifilia spores that wrap around the Crawler Fly, however, are not particularly durable and allow to obtain the best on the creature using a simple gun with flashlight.