The Reaper resulted when a cockroach-like creature was infected with trace amounts of the Uroboros Virus, transforming it into a B.O.W. The creatures emerge from their cocoons mounted with blade-like protrusions on each of their arms, and it is from these "scythes" that the creature takes its name. A Reaper can use its blades to capture and fatally wound its prey, or spit out a caustic substance capable of causing temporary blindness. Its shell is hard enough to deflect standard bullets.