A Word On "Jörmungandr"

Jörmungandr (pronounced [ˈjœrmuŋɡandr], mostly known as Jormundgand, the Midgard Serpent, Midgårdsormen, or World Serpent, is, in Norse mythology, a sea serpent, and the middle child of the giantess Angrboða and the god Loki. According to the Prose Edda, Odin took Loki's three children, Fenrisúlfr, Hel and Jörmungandr. He tossed Jörmungandr into the great ocean that encircles Midgard.
 

The serpent grew so big that he was able to surround the Earth and grasp his own tail. When he lets go the world will end. As a result he earned the alternate name of the Midgard Serpent or World Serpent. Jörmungandr's arch enemy is the god Thor.

The last meeting between the serpent and Thor is predicted to occur at Ragnarök, when Jörmungandr will come out of the ocean and poison the sky. Thor will kill Jörmungandr and then walk nine paces before falling dead, having been poisoned by the serpent's venom.