Boreal
Boreal was the Ice Emperor 's loyal Elemental Dragon , [ 2 ] being made of pure Ice by the Emperor sometime after the latter took over the Never-Realm . He was also the fearsome and dreaded ice dragon that guarded the Castle of Ice . Zane used him to freeze the Village of the Formlings and the Great Lake . Boreal attacked the ninja while they went to rescue Lloyd , and was eventually disintegrated into water by Kai , who regained his power . .