Fimbulwinter

This is not a creature, but rather an event.  It is the long perilous winter that precedes the Viking's version of the end of the world. That, of course, would be Ragnarök.  It's the seriously wintry portend of the end of world.  Sorry Family Stuff today.   See Fimbulwinter.  

Here's one of the wintry creatures destruction of the Norse Gods.  This is Fenrir, who is often depicted as a wintry wolf.  He is the destructive monster who actually defeats and kills the greatest God in Norse mythology, Odin!