What is the prophesied end of the world in Norse mythology?

The story behind the answer

Ragnarök is the Norse apocalypse: a foretold chain of events—cosmic winter, broken bonds, and final battles—where gods and monsters clash, many die (Odin vs. Fenrir; Thor vs. Jörmungandr), the world burns and sinks, and then renews. That makes Ragnarök the correct choice for the prophesied end of the world.

Context to sort the terms: Fimbulwinter is the long, brutal winter that precedes Ragnarök; Surtr (Surtur) leads the fire giants who ignite the world during it; Valhalla is the hall where fallen warriors gather to fight at Ragnarök, not the end itself. Memory tip: Ragnarök = ragna (gods) + rök (fate), “the gods’ fate.” Think: Fimbulwinter starts it, Surtr fires it, Valhalla staffs it—but Ragnarök names the whole doomsday and rebirth.