The Drain Deimos are mutant fleas that were infected by eating the flesh of infected animals. Like many arthropods, the fleas responded to the virus by increasing in size and strength considerably.
Their appearance is particularly grotesque as their exoskeletons are torn in places and their muscles are exposed, due to their quick and rapid t-Virus induced growth. They are accidental creatures, and were not created as B.O.W.s.
A Drain Deimos next to Jill in RE 3
They can scale walls and attack by slashing at or grabbing and biting their prey. Although not as fast as some enemies, this monster can rise up on its rear legs and 'run' at the player. If the player cannot escape, it will grab the character and plunge its jaw into their skull in order to extract the cerebra-spinal fluid, which seems to be a favoured food. The Deimos can also use its powerful back legs to leap around its preferred hunting grounds, in order to close the distance between itself and the player or to prevent an escape.
These monsters prefer places that are dark and damp, frequently lurking in back alleys and old buildings.
There is also a lesser seen, poisonous cousin to this creature, called the Brain Sucker.
Like many other t-viral creatures, the Drain Deimos takes its name from mythology, in this case Deimos, the Greek personification of dread.
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