The parasitic Brood reproduces asexually and therefore has no clear divisions of gender. They reproduce by forcibly implanting their eggs into other sentient organisms (host). Each host can only support one egg. Upon hatching, the hosts will effectively die as the Brood egg release enzymes into the bloodstream of its hosts, gradually mutating them. At the same time, the Broodling begins to psychically attack its host, taking control of its mind, absorbing the genetic material and incorporating all its knowledge and memories into the Brood. They appear to be capable of even infecting demons or someone who is possessed by a demon like Ghost Rider.