Nordic speculation down to Richard Wagner has dwelt with gloomy satisfaction on Ragnarok, the Twilight of the Gods, which will destroy the world. There is the prediction in the Song of Sibyl, and also in Snorri's Gylfaginning: when the great dog Garm barks in front of the Gnipa cave, when the Fenrir wolf breaks his fetters and comes from "the mouth of the river," his jaws stretching from Heaven to Earth, and is joined by the Midgard Serpent, then Heimdal will blow the Gjallarhorn, the sound of which reaches through all the worlds: the battle is on. But it is written that the forces of order will go down fighting to atone for the initial wrong done by the gods. The world will be lost, good and bad together. Naglfar, the ship of the dead, built with the nail pairings of the living, will sail through the dark waters and bring the enemy to the fray. Then adds Snorri:
The heavens are suddenly rent in twain, and out ride in shining squadrons Muspel's sons, and Surt with his flaming sword, at the head of the fylkings.
All engulfing flames come out with Surt "the Black," who kills Freyr, the Lord of The Mill. Snorri makes Surt "Lord of Gimle" and likewise the king of eternal bliss "at the southern end of the sky." He must be some timeless force which brings destructive fire to the world.
by Giorgio De Santillana & Hertha Von Dechend