There was a great winter that lasted the length of three normal winters. Mankind became savage and began murdering each other.
The wolves Skoll and Hati ate the sun and the moon. The stars also disappeared leaving nothing but a black void in the heavens.
Yggdrasil, the great tree that holds the cosmos together, trembled & all the trees & mountains fell to the ground. Fenrir escaped, devouring everything in his path along with the mighty serpent, Jormungand. These convulsions shook the ship, Naglfar, free from its moorings, the captain of Naglfar being non other than Loki.
The dome of the sky split, and from the crack emerged the fire-giants from Muspelheim. The leader of the fire-giants was Surt, who carried a flaming sword brighter than the sun in is hand.
As the fire-giants marched across the Bifrost, the bridge broke and fell behind them. Heimdall, the divine sentry, sounded his horn to announce the arrival of the moment the gods had feared.