Gwent: Master Mirror is an add-on for the card game "Gwent", which is dedicated to the first monster slayers and will introduce new cards to the game. According to the lore of the universe, the witchers were created by the powerful sorcerer Alzur. Professional killers gained superhuman strength and agility and founded the first witcher schools. With the addition, six development paths will appear in the game: the path of the bear, cat, griffin, snake, mutant and salamander. Each of them has its own characteristics.