As soon as you begin exploring the Hearts of Stone DLC in The Witcher 3 a tutorial prompt introduces the Runewright. This Witcher 3 Hearts Of Stone – Where To Find The Runewright guide tells you where to find the Runewright so you can get working on your new Runes as soon as possible.
Whether you choose to start afresh, continue your previous save or explore Hearts of Stone with a specially made save that includes a level 30+ character, items, equipment and attribute points, you’ll want to find the Runewright as early as possible.
The Runewright can be found in the Upper Mill area, East of Brunwich. Geralt’s position on the image below is the exact location of the Runewright.