Ragnarok

In the day of Ragnarok, the monstruous dog -Fenrir will be unchained by the evil forces... Fenrir will kill Odin while the giant snake called Jormunguand rounds the world with its tail... Almost every god will die in the final battle with the giants... Only a few gods will survive Ragnarok and be able to restore the world.

This is apocallypse told by vikings...