The Hearts of Stone expansion for The Witcher 3: Wild Hunt introduces a large amount of new content for Geralt of Rivia to experience. At the center of this content is a new main storyline that finds Geralt in a battle of wits with the unassuming mirror merchant Gaunter O'Dimm. Like much of the content in The Witcher 3, this tale takes several twists and turns before arriving at its epic conclusion.