Gaunter O'Dimm, sometimes called Master Mirror or Man of Glass, is a minor character in The Witcher 3: Wild Hunt, and is the main antagonist of the Hearts of Stone expansion. He presents himself as a former merchant of mirrors, now a mangy vagrant. However, as one might suspect, he is a much more powerful individual, creating pacts with people in exchange for their souls and being able to control time with a mere clap of his hands.