Ragnarok (n.)

in Norse mythology, the last battle of the world, in which gods and men will be destroyed by monsters and darkness, 1770, from Old Norse Ragnarök, from ragna, genitive of rögn "gods" + rök "destined end" or rökr "twilight," which is related to reykr "smoke, steam" (see reek (v.)). Compare Gotterdammerung.

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Definitions of Ragnarok from WordNet

Ragnarok (n.)
myth about the ultimate destruction of the gods in a battle with evil;
Synonyms: Gotterdammerung / Twilight of the Gods
From wordnet.princeton.edu