Thornwald
From Witcher Wiki
Thornwald' was the witcher who saved Geralt's father from a pack of werewolves and laid claim on Geralt in accordance with the Law of Surprise.
Years later, Geralt faced him in a trial of swords because Geralt had defied the traditional ways of the witchers. They both wore heavy armour, Geralt for the first time in his life. Still, he walked out of it alive. Thornwald didn't.
Played by Walery Jonin.
