A giant leech. It devours the flesh of its prey with a massive mouth while draining their blood, leading to death. Furthermore, due to the high-concentration virus carried by the leech, victims who are attacked have a high probability of turning into zombies. It does not speak.

Originally a parasitic insect as small as a flea. It is roughly the size of a human chest. Its primary nutrient is human cerebrospinal fluid; it pounces on humans, thrusts its proboscis into their throat to suck up bodily fluids, and implants eggs. ⚠︎ If the victim dies while the eggs are still implanted, their chest and abdomen will burst open, and a swarm of Drain Deimos larvae will crawl out. It does not speak.

A parasite. A terrifying parasitic organism that invades the host's body, seizes control of the central nervous system, and turns them violent. Infection occurs when eggs or larvae are implanted into the victim's body. Improved strains can infect a host by having an adult parasite forced directly into the mouth. Humans parasitized by Las Plagas are called "Majini." It does not speak.

Pesanta, a close aide to Ramon. It implants a special parasite that induces hallucinations.