Final destiny of the gods
Heimdall holds the Gjallarhorn into the air and blows deeply into it, and Odin converses with MÃm's head. The world tree Yggdrasil shudders and groans, and the road to Hel is consumed in flames. The jötunn Hrym comes from the east, his shield before him. The Midgard serpent Jörmungandr furiously writhes, causing waves to crash. "The eagle shrieks, pale-beaked he tears the corpse", and the ship Naglfar breaks free and sets sail from the east, containing the fire jötunn inhabitants of Muspelheim as Loki steers.
The Völva continues that all of Jötunheimr, the land of the jötunn, groans, and that the Æsir hold an assembly, and that the dwarves howl outside of their stony mountain walls. Leading the fire jötunn, Surtr advances from the south, his bright sword shining. Rocky cliffs open and the giant women sink. People walk the road to Hel and heavens split apart.
The gods then do battle with the invaders: Odin dies fighting the wolf, causing his wife Frigg her second great sorrow (the first being the death of her son, the god Baldr). The god Freyr is described as fighting Surtr. Odin's son VÃðarr avenges his father by stabbing Fenrir in the heart, killing the wolf. The serpent Jörmungandr opens its gaping maw, yawning widely in the air, and is met in combat by Thor. Thor, also a son of Odin and described here as protector of the earth, furiously fights the serpent, defeating it, but only able to take nine steps afterwards before collapsing. After this, people flee their homes, and the sun becomes black while the earth sinks into the sea, the stars vanish, steam rises, and flames touch the heavens.
and another take
In Norse mythology, Ragnarök (IPA: /ragnarɔk/, Old Norse "Final destiny of the gods"[2]) is a series of major events, including a great battle foretold to ultimately result in the death of a number of major figures (including the gods Odin, Thor, Freyr, Heimdall, and the jötunn Loki), the occurrence of various natural disasters, and the subsequent submersion of the world in water. Afterward, the world resurfaces anew and fertile, the surviving gods meet, and the world is repopulated by two human survivors. Ragnarök is an important event in the Norse canon, and has been the subject of scholarly discourse and theory.
The event is attested primarily in the Poetic Edda, compiled in the 13th century from earlier traditional sources, and the Prose Edda, written in the 13th century by Snorri Sturluson. In the Prose Edda, and a single poem in the Poetic Edda, the event is referred to as Ragnarökr or Ragnarökkr (Old Norse "Twilight of the Gods"[3]), a usage popularized by 19th century composer Richard Wagner with the title of the last of his Der Ring des Nibelungen operas; Götterdämmerung.[4]
from wikipedia.org