The witcher trials are primarily a series of three grueling stages in the witcher training process. First comes The Choice, which involves dietary changes and grueling physical training. Young witchers are taught sword skill, monster lore and herbalism. The main trials are as follows:
- The Trial of the Grasses, which involved consuming various alchemical ingredients, or "the grasses" and affected the nervous system,
- The Trial of the Dreams, which involved the mutation of the eyes, bone marrow and hormones, allowed for better night vision, among other benefits. It also resulted in infertility.
- The Trial of the Mountains
Due to his remarkable resilience to the "normal" trials, Geralt was also subjected to additional, even more experimental trials, hence his superior abilities and also his white hair.