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Under the leadership of the MasterHarper, such as MasterHarper Robinton of the Ninth Pass, the harpers utilise music as a teaching tool and are sent out to all Holds and Crafthalls to provide training. Being spread throughout the various settlements, harpers see and hear much, and report back to the Harper Hall.
The Master Rank stone was a Sapphire 
A Harper can specialize in one of several other "sub-crafts". If this happens, the person is still part of the Harper organization, but they take on the title of their "sub-craft" as follows: