Neyzor

Duty is a militarized group that strictly adheres to its charter and hands over all found artifacts and information about anomalies to scientists. Freedom of action and speech are not permitted in Duty. The group's goals are: The destruction and clearing of the exclusion zone of mutants, anomalies, and other dangerous places. They eliminate mutants through extermination, and they also fight crime in the zone, meaning they are at odds with bandits. Their main goals make "Freedom" their enemies.

Freedom – This group allows its fighters to act and think freely, granting its members complete freedom. They are friendly to almost everyone except bandits and Duty. Because of this freedom, the group often attracts various drunks, and even worse. Their main goals are: to preserve the Zone, as they consider it the only truly free place, and to maintain friendly relations with other Stalkers and Groups.

Bandits - A group of various robbers, thieves, and bandits, and those brought to justice for a variety of reasons; bandits are a gathering of criminals and convicts who hide in a lawless zone, also seeking to make money. Bandits are often excluded from trade due to their behavior. The bandits engage in robbery, banditry, and all sorts of crimes because they have free rein in the zone.

Monolith is a group of zombified individuals, a vast number of people, stalkers, and members of other factions, all controlled against their will. They are zombified after being exposed to "Psi-Radiation," which severely affects the human brain. After being exposed to Psi-Radiation, a person submits to the will of the "Monolith" and obeys the commands of the voice in their head, which they call the "Monolith". Monolith – One of the most dangerous, powerful, modern, and numerous groups in the Zone. Due to their fanaticism, they can often ignore wounds and abrasions, continuing to move forward.

Scientists are researchers and biologists who study the artifacts, anomalies, and features of the exclusion zone. Scientists are drawn from various countries, their goal being to fully investigate all the phenomena and creations of the zone. The scientists are sponsored by their respective governments.

Mercenaries are a paramilitary group of people hired for money to perform tasks, missions, and work; they are hired for everything. The identities of both the clients and the mercenaries themselves are kept strictly secret. Upon agreeing to hire them for any job, the hired mercenary or mercenaries sign a contract with the client. The mercenaries also differ greatly in nationality, and almost each one has their own specialty. They are well-trained for almost anything.

April 26, 1986: An accident occurred at the Chernobyl Nuclear Power Plant, causing a large explosion that released radiation over hundreds of kilometers, contaminating vast residential areas and turning them into dead cities polluted by radiation and mutants. Mutants are animals and humans mutated by radiation, and as a result of painful mutations, they have become very resilient, strong, and extremely aggressive towards humans, ranging from small rats to quite large and heavy deformed creatures. Also, so-called "Artifacts" began to appear in the zone, which can grant their owner unique abilities, or they can be sold to traders in the zone for a very large sum of money. Anomalies are specific locations where death is easy, as anomalies are dangerous places: electro-anomalies with incredibly high electrical charges, and also, similar to volcanoes, holes from which red flames and a large number of other deadly phenomena emerge.