Quote:
what the hell is the ragnarok
Loki slips from his chains and joins the jotuns (giants), they ascend on Asgard along with the dishonored warriors being brought from Hel. Loki and Heimdall slay eachother.
Fenris breaks his bond, devours Odin alive, is later killed by Viorr.
Thor narrowly defeats the brother of Fenris, Jormungandr, but is poisoned and dies shortly after.
Surtr, who leads the jotuns, will fight and slay Freyr, but Freyr will manage to shove his horn in his eye, and in his rage, Surtr will scorch the earth.
The world then sinks into the sea, eventually engulfing the fires that touch the heavens.
The waters recede, a volva witnesses an eagle fishing over a waterfall, and the few remaining gods meet upon the battlefield, and discuss events.
TL:DR
Ragnorak is the Norse Pagan (Viking) description of the death and rebirth of the world.