Kylmyys (the Finnish word for coldness) is an ice-cold world and the home planet of the Necrofriggians. They also have colony of Necrofriggians on Mykdl'dy. Kylmyys is an icy and cold world that was long thought to be uninhabited. It is full of large glaciers and snowstorms much like the Earth's Ice Age and it also has many deep caves. Necrofriggians live in the caves on this world and Kylmyys's weather is the source of their amazing ability to breath ice blasts.