Gotterdammerung, Ragnarok, Twilight of the Gods(noun)

myth about the ultimate destruction of the gods in a battle with evil

Ragnarok(ProperNoun)

The final battle between gods and giants, involving all creation, which brings the end of the world as it is known and almost all life.

Ragnarök

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."