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"Nine worlds: the worlds of the gods (Asgarth), of the Wanes (Vanaheim), of the elves (Alfheim), of men (Mithgarth), of the giants (Jotunheim), of fire (Muspellsheim), of the dark elves (Svartalfaheim), of the dead (Niflheim), and presumably of the dwarfs (perhaps Nithavellir, cf. stanza 37 and note, but the ninth world is uncertain). The tree: the world-ash Yggdrasil, symbolizing the universe." 
Muspelheim is described as a hot and glowing land of fire, home to the fire giants, and guarded by Surtr, with his flaming sword. It is featured in both the creation and destruction stories of Norse myth. According to the Prose Edda, A great time before the earth was made, Niflheim existed. Inside Niflheim was a well called Hvergelmer, from this well flowed numerous streams known as the Elivog. Their names were Svol, Gunnthro, Form, Finbul, Thul, Slid and Hrid, Sylg and Ylg, Vid, Leipt and Gjoll. After a time these streams had traveled far from their source at Niflehim. So far that the venom that flowed within them hardened and turned to ice. When this ice eventually settled, rain rose up from it, and froze into rime. This ice then began to layer itself over the primordial void, Ginungagap. This made the northern portion of Ginungagap thick with ice, and storms begin to form within. However, in the southern region of Ginungagap glowing sparks were flying out of Muspelheim. When the heat and sparks from Muspelheim met the ice, it began to melt. These sparks would go onto create the Sun, Moon, and stars, and the drops would form the primeval being Ymir. "by the might of him who sent the heat, the drops quickened into life and took the likeness of a man, who got the name Ymer. But the Frost giants call him Aurgelmer"
In the midst of this clash and din the heavens are rent in twain, and the sons of Muspell come riding through the opening. Surtr rides first, and before him and after him flames burning fire. He has a very good sword, which shines brighter than the sun. As they ride over Bifrost it breaks to pieces, as has before been stated. The sons of Muspel direct their course to the plain which is called Vigrid.... The sons of Muspel have there effulgent bands alone by themselves.
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