|Universe||Ben 10 Universe|
Kylmyys (the Finnish word for coldness) is an ice-cold world and a home planet of the Necrofriggians
Kylmyys is an icy cold world that was long thought to be uninhabited. It is full of large glaciers and snowstorms much like the Earths Ice Ages and it also has many deep caves. Necrofriggians live in the caves on Kylmyys.