The Sky class is one of the three rarest classes of Harnessers in Maailma, combining the elements of wind, sun, and lightning. It, like the Earth and Life class, were highly coveted after the end of the Great War. Because of extensive militant use of Sky Harnessers, the class sees a dangerous chance of becoming completely extinct. 

The only recorded Sky Harnessers alive today are Avel Cuinn and his son, Jónsi.