O'Dimm helps Geralt escape, but in return, Geralt must help O'Dimm recover a debt from von Everec, who had set up Geralt knowing the toad monster was an Ofieri prince. While awaiting his execution en route to Ofier, Geralt is approached by the mysterious Gaunter O'Dimm. The prince's guards capture Geralt with the intention of executing him.

Geralt then kills the toad monster, only to find it was actually a cursed Ofieri prince. While hunting the monster, Geralt runs into Shani, a medic and an old acquaintance of his, whom he has the option of romancing. Geralt takes up a contract sent out by a noble named Olgierd von Everec, who tasks him with eliminating a giant toad monster in the sewers of Oxenfurt. The expansion is an adaptation of the Polish folktale of Pan Twardowski, following Geralt of Rivia coming in contact with a mysterious man known as Gaunter O'Dimm, and his connections to Olgierd von Everec, a cursed nobleman.

Developed by CD Projekt Red, Hearts of Stone was released for PlayStation 4, Windows, and Xbox One on 13 October 2015, later released for the Nintendo Switch on 15 October 2019, with PlayStation 5 and Xbox Series X/S versions released on 14 December 2022. The Witcher 3: Wild Hunt – Hearts of Stone is the first expansion pack for the 2015 video game The Witcher 3: Wild Hunt.

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