A region in the United States that is currently completely sealed off. Often referred to simply as Monochrome.

A quadrupedal creature, just as the name "Animal" suggests. It has a human-like head, and its entire body is covered in a thick, grey, leathery hide. It primarily lives in forests, preying on wild animals, but occasionally descends into town to attack humans. If encountered, one should back away without turning their back and retreat to a safe place; however, if the creature is starving, one must run for their life. It is roughly the size of a deer. It cannot speak.

As the name implies, this creature monitors a targeted subject and waits for the most opportune moment to attack. It has black skin, three legs, a single large eye positioned in the center, and a long tentacle atop its head used for attacking humans. It usually watches prey from a distance, and when the prey enters a secluded area, it charges, covers their face, and pierces their neck with its tentacle. If encountered, one should exploit the fact that it cannot turn during a charge by dodging to the side and then stomping it to death. It is roughly the size of a full-grown cat. It cannot speak.

A monster that roams in search of humans to kill, living up to its name. It hides in places people rarely visit during the day and emerges at night to attack and consume them. It has a pale white face, black skin from the neck down to the toes, eyes showing only whites with dark circles, and a grotesquely grinning, torn mouth. Though it is a large humanoid monster standing 3 to 4 meters tall, it is susceptible to physical force; if you have a weapon like a firearm, you can injure it by shooting its legs and then escape. However, killing it is nearly impossible without explosives, so avoid combat whenever possible. It cannot speak.

A monster that breaks into a target's home, torments them mentally, and eventually devours them. It usually wanders the city while invisible, but once it selects a target, it infiltrates their home and stays for a long period to inflict psychological damage before consuming them. If you realize it has entered your home, your only chance of survival is to abandon the house and flee. It is approximately 2.5 meters tall, takes the form of a black human silhouette, and has a mouth torn from the top of its head down to its neck. Eyes are located on both sides of the vertically torn mouth. It cannot speak.

Despite the name, it takes the form of an ordinary human. However, this is a fake appearance used to blend into human society; its true form has black skin, grotesquely large eyes, and a wide-gaping mouth. It normally follows a target's movements naturally, then brutally murders them once they reach a dark, secluded spot. Fortunately, its speech is very slurred and awkward, so if someone keeps following you, it is best to try starting a conversation. If you do, it will give up on you and go elsewhere. It has the average build of a sturdy adult.

The most mysterious entity. Almost nothing is known about it, other than the fact that it is the only one of its kind among the monsters. A chronicler who drew sketches of the monsters encountered so far was killed the day after sketching this entity to identify its traits upon seeing it staring at him. It takes the form of a 3-meter tall woman, but her entire face is obscured by long black hair, leaving no visible features. She has a thin body and a pair of bone-like protrusions resembling ribs sticking out from below her armpits. While information is scarce, survivors have testified that she kidnaps people she takes an interest in, leading civilians to call her "The Collector." It is impossible to kill her with physical force, and attacks from other monsters are ineffective. She is capable of speaking human languages fluently and can mimic the voices of others, but she does not speak as she feels no need to. She appears and disappears in an instant and never shows herself unless there is a special reason.