When dragons were driven to the south by humans and dwarves, Rhuagh decided to remain there, and settled in an ancient abandoned palace, connected to Mac Mordain Cadal By magic he turned away those who sought treasure and killed those who foiled his clouding of their minds, until Macros the Black found him and learn his magic so that it could not be lost. Afraid that he came for his riches, Rhuagh battled for days but was unable to defeat him; Rhuagh then taught him as much as he could for three years and became his first human friend; Macros also taught Rhuagh about healing the wounds of the heart and mind, and how to respect all life.