The Witcher
Zdenek is the reigning world champion in fistfighting. He is undefeated. Well... no one has beaten him twice in a row... until Geralt, that is! He can be found in the southernmost refugee cave in the swamp cemetery. At least he has the decency to keep his fistfights to the privacy of his own chamber in the cave.
Associated Quests
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The Witcher 2: Assassins of Kings
Zdenek also makes an appearance in The Witcher 2, though his appearance has changed considerably.