Geralt, the central character, is a witcher. Shortly after being born, Geralt was forced (by the law of surprise) to undergo training and, eventually, become a witcher at Kaer Morhen — the stronghold of the Wolf School Witchers. Geralt survived numerous mutations during the Trial of the Grasses (alongside the extra mutations), thanks to which he gained practically superhuman physical and mental abilities with minimal side effects. He resisted the "changes" brought on by the Trial of Grasses better than most, which encouraged his makers to perform even more dangerous experimental procedures on him, making him lose all body pigmentation. Because of his pale skin and white hair, he is also known in the Elder Speech as "Gwynbleidd", the White Wolf.