There was a great winter that lasted 3 years, humans became barbaric in this time and attacked one another.
Yggdrasil, the great tree, will fall, causing all tree's and mountains to perish with it. The wolf, Fenrir, will be free and Jormungard, the mighty serpant will rise from the depths of the ocean, freeing the ship Naglfar- captained by Loki.
The sky splits and from it shall emerge the fire-giants of Muspleheim. As they march across the rainbow bridge to Asgard, home of the gods, the bridge will fall behind them. Heimdall will sound his horn as Odin consults Mimir for counsel.