Drain Deimos are mutated insects that appear as enemies in Resident Evil 3: Nemesis. These grotesque monsters were originally common fleas that contracted the T-virus by feeding on the blood of other infected creatures. In response to the infection, the fleas rapidly grew in size, becoming as large as an average human adult.
The Drain Deimos is horrendously disfigured, possessing multi-jointed, awkwardly proportioned limbs ending in sickle-shaped claws. Their bodies are covered in insectoid chitin, but the chitin is cracked and torn in various places, exposing patches of muscle tissue.
Drain Deimos usually move quite slowly unless there is prey in the immediate area. Their claws allow them to crawl along walls and ceilings, though when they encounter prey they will drop to the ground, get up on their rear legs and 'run' at the potential victim. Their wickedly-sharp claws can rend humans to pieces very quickly and the creatures feed by biting open the victim's skull and draining the cerebra-spinal fluid.