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When a person's life is saved, their savior might ask the debt be repaid by The Law of Surprise. The Law of Surprise is an important custom in The Witcher's universe. The school of the Viper is introduced in the games. The novels reference three schools, the Wolf, the Cat and the Griffon. The story of how Witchers were first created is lost to time, but Witcher schools, such as the school of the Wolf where the series' protagonist Geralt trained, were built to facilitate the process of mutating and training new Witchers. A few romanticize their order, while many tolerate them as a necessary evil. Because Witchers are mutated and considered inhuman, public opinion about them varies. Monsters ran rampant, and Witchers were created as a defense against evil beasts.
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Witchers became necessary after an event known as the "Conjunction of the Spheres" introduced monsters to the world. They live much longer than otherwise possible, but are sterilized as part of the mutation. They also have the ability to use Signs, which are basic magic spells.
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Witchers are for-hire monster hunters who are mutated and trained during childhood to be significantly faster and more resilient than an average human.