Description
Depending on the stage of its life cycle, the Slug can look like an everyday garden slug, a miniature slug with wings, or a human being.
Ecology/Lifestyle
A Slug begins its life in a winged larval stage. This tiny Slug flies until it finds an appropriate spot of dank, dark ground, where it can shed its wings and begin to grow. At this point the Slug grows dozens of sharp teeth. It then seeks out a human being to serve as a host body. It bites the person, puts him to sleep, crawls inside, then nests in his stomach. Over the next six months, the Slug grows. Eventually it consumes all the human's internal organs and replaces them with its own. The Slug absorbs the human's memories, and continues living as the human. The Slug at this point cannot exist outside the human body; the skin and bones have been absorbed into its own anatomy. Once the habitation is complete, the Slug seeks out another of its kind, following the scent of their pheromones. Slugs will work in concert to further their goals. The creatures have some sort of social organization, but little is known about it. The exact goals of the Slugs are also unknown. Periodically, two Slugs will mate. Within six months, one of the Slugs grows a spore sac in its stomach. Eventually the spore sac ruptures, the Slug dies, and dozens of new larval Slugs are released into the world.
Haunts & Habitats
Wet, dark places; human beings.
Lifespan
Seven years.
Detection
Again this depends on the stage of its life cycle. When larval, Slugs may be detected by their wings. When Slugs, they have larger teeth than average, and unusual coloration. Detecting Slugs is most important, though, when they have inhabited human bodies. It is important to differentiate between two stages: the stage at which the Slug is still a parasite living inside the human, and the stage at which the human's brain has been devoured and the Slug is the totality of the organism. A person with a Slug inside is a victim. Symptoms include fatigue, depression, memory loss, and blue-tinted secretions from the genitals. Such people need immediate medical attention. When a Slug has entirely taken control of a person, however, the resulting entity is officially a kill-on-sight organism. Warning signs include drastic personality shifts, lack of empathy, and jerky, uncoordinated movements. A Slug can be found out through an x-ray or blood test. In the final stages, a Slug can be recognized by the spore sac growing in its stomach. This causes the individual to appear pregnant, even if the individual is male.
Vulnerabilities
Once detected, a Slug is vulnerable to most attacks. On their own, they can be killed just like regular slugs; salt has proven effective at this stage. A Slug infesting a human body will be harder to kill than the average human?they are slightly stronger and more resistant to damage?but will still be vulnerable to any standard attack.
Additional Information
For a time Slugs were presumed extinct, until a live Slug turned up in New York City in 2000. The full implications of this are not yet known, but all agents need to be constantly on the lookout for Slug activity. When hunting these creatures, it is of utmost importance that field agents are certain that they are killing a Slug and not a human.
Monster Database 
