Let's begin...
Everyone who know something about this should join this.
Fisrt song to explore is "Hermods Ride to Hell"

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Hermod is the son of Odin. He tried to retrieve the fallen hero Balder from Hel. Hel is a person and a place in the Norse Mythology. Hel is the daughter of Loki and Mistress of a part of Niflheim, the afterlife Realm of the Nordic cultures.
So, Hermod rides to Hel seated on Sleipnir, the 7 footed war horse of Odin. In the hall of Hel, he asks Hel if she could release Baldr from death. Hel agrees if everything on Earth would cry for Baldr.

Hel was skeptical and agreed to release Balder on the condition that everything, dead or alive, should weep for Balder. If only one thing should not cry, then she would keep Balder in the Realm of the dead. Hermod returned to the land of the living and told the Gods what Hel's terms were. But not everyone wept and therefore Balder had to remain in the underworld until The End of the world.

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As during Ragnarok, all dead Warriors will rise from the dead for the final battle...

And Balder was accidentally killed by his Blind brother Hod.

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All I know about this song...it's just a good song.
Hailz Amon Amarth!
Bye!!

Sometimes you can find out something new.

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"Guardians of Asgaard" Well I just know that Asgaard was built by Borr's sons, Odin, Vili and Vé,and it's like a big temple where the Ases are living..

Asgaard is actually one of Nine Worlds in Norse mythology.
Valhalla is located within Asgard. Odin and his wife, Frigg, are the rulers of Asgard.

So, now, we have another term to explain - Valhalla.

Valhalla is very common in Amon Amarth's lyrics.

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The paradise of vikings Warrior ?  From what I know.