In Norse legends, the creature known for its multi-headed form is the Jörmungandr, also called the Midgard Serpent. This colossal serpent encircles the world, embodying chaos and the threat to order. Its battle against Thor during Ragnarök symbolizes the ultimate conflict between good and evil. The multi-headed nature of such creatures in various mythologies often represents overwhelming power, uncontrollable forces of nature, and the complexities of existence.