What is the Norse end of the world?

Answer 1

The Norse called their view of how the world would end Ragnarok. That's when Loki would get free, his wolf son would kill Odin, Thor would die, an other all bad time. However, after it was over Thor's two sons, Modi and Magni, would get their dad's hammer and Balder would finally get out of Niflheim.

This answer needs more detail. I am not a scholar of Norse mythology but an avid watcher of Historical documentaries with a good memory.

After Thor's death, a period of eternal winter descends about the earth. Unlike most cultures who envision hell as a place of fire, to the Norse it was frozen. Unlike most religions who envision the end of the world ends in fire, to the Norse it ends in eternal winter. This Ragnarok was the basis of Wagner's epic Opera aka "The Ring Cycle" or "The Twilight of the Gods".

A scholar needs to elaborate on Ragnarok and what happens after Thor's death here.