Jörmungandr

From Old Norse Jǫrmungandr, derived from jǫrmun "great, immense" and gandr "monster, magic, wand". In Norse mythology Jörmungandr was an enormous sea serpent, also known as the World Serpent because he was said to encircle the world. He was one of the offspring of Loki and Angrboða. During Ragnarök, the battle at end of the world, it is said that he will fight his old enemy Thor and both of them will die.