Drain Deimos are derived from haematophagous (blood-sucking) insects, though have evolved to be dependent on on human cerebrospinal fluid, which they extract through a needle-like body part. In their enlarged state they may kill the human.
The creature's appearance is particularly grotesque due to the exposure of muscles brought on by the rapid t-Virus induced growth, which forces the creature to undergo repeated molts.
Drain Deimos are an asexual, all-female species and thus reproduce through parthenogenesis, a form of reproduction seen in some insects where embryonic development is induced in unfertilised eggs. Drain Deimos start to lay eggs when they have consumed a certain amount of nutrients.[excerpt 1]