Ragnarök
Webster's Dictionary [1]
(1): ( n.) Alt. of Ragnarok
(2): ( n.) The so-called "Twilight of the Gods" (called in German Gotterdammerung), the final destruction of the world in the great conflict between the Aesir (gods) on the one hand, and on the other, the gaints and the powers of Hel under the leadership of Loki (who is escaped from bondage).
The Nuttall Encyclopedia [2]
In the Norse mythology the twilight of the gods, when it was predicted "the Divine powers and the chaotic brute ones, after long contest and partial victory by the former, should meet at last in universal, world-embracing wrestle and duel, strength against strength, mutually extinctive, and ruin, 'twilight' sinking into darkness, shall swallow up the whole created universe, the old universe of the Norse gods"; in which catastrophe Vidar and another are to be spared to found a new heaven and a new earth, the sovereign of which shall be Justice. "Insight this," says Carlyle, "of how, though all dies, and even gods die, yet all death is but a Phoenix fire-death, and new birth into the greater and the better as the fundamental law of being."