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In Iceland, there is one of the most bloodcurdling Christmas characters in the world

In Iceland, there is one of the most bloodcurdling Christmas characters in the world—a cannibalistic, hideous giantess called Gryla. She also has a fearsome cat.
Gryla is a troll who has been mentioned in Icelandic folklore since at least the 13th century. 
At some point, she became more associated with Christmas and has put her nasty talents to festive use. 
Gryla stalks the children of Iceland during the holiday season. 
If she finds any bad children, she stuffs them in her sack and carries them away to devour later.