Ragnarök has as topic the epic end of the world of the norse mythology. It begins with the death of Balder and the Fimbulvinter, and the children of Loki will fight against the gods. At the end, a new world will happen, and Balder will be reborn. Happy Day of the Einherjar!
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https://www.youtube.com/watch?v=6rSvtJks8iw