Ragnarok (n.)youdaoicibaDictYouDict[Ragnarok 词源字典]
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 ragna, genitive of rögn "gods" + rök "destined end" or rökr "twilight." Also see Gotterdammerung.[Ragnarok etymology, Ragnarok origin, 英语词源]