Rus Yilmaz was a mamar alchemist and craftsman who lived during the time of the crystal death. Rus was well-known in his hometown of Bostra for his scholarly prowess as well as his unflappable demeanor. Later in his life, he became the tutor of Delos' and Solana's children and traveled with them to Lith on a visit to the Forest of Shadows, and afterwards remained on Lith until his death.