Gwent: Master Mirror — an expansion for the card game "Gwent: The Witcher Card Game", dedicated to Gaunter O'Dimm, known from The Witcher 3: Wild Hunt and the expansion The Witcher 3: Hearts of Stone. The expansion will feature new mechanics: "Devotion" and "Echo". Additionally, more than 80 new cards will become available. Legendary dynamic cards will appear, which increase their power with each subsequent round.