Geralt is a witcher, a magical mutant made for hunting and killing monsters. Shortly after being born, Geralt's mother, Visenna, gives him away to undergo training and, eventually, become a witcher at the School of the Wolf at Kaer Morhen – the stronghold of the Wolven school witchers.[4] His mentor and father figure there was a wise man and warrior named Vesemir.[5] Geralt survives mutations during the Trial of the Grasses, thanks to which he gains various witcher traits: high resistance to injury, poison, and diseases, as well as slowed aging. Uniquely, Geralt had an unusual tolerance for the trials and was subjected to experimental mutagens as a result. Due to this, it caused the loss of all body pigmentation, leaving him with pale skin and white hair, which is the reason why he is referred to as Gwynbleidd in the Elder speech (close to the Welsh translation "Blaidd Gwyn"), meaning "The White Wolf".
