[@ouTland01] a shade hasn't ever been a dragon rider I think as they are usually evil and the multiple spirits inside them make it hard to have a dragon 

Shades were usually created when a sorcerer or sorceress summoned a spirit or spirits that he or she couldn't control and consequently became possessed by it or them in both mind and body. According to Angela, some magic users willingly submitted to the control of spirits in order to gain greater magical power, thus becoming a Shade.