The end of all events occurred due to the eternal wars of the races and factions. When everything is gone and everyone's destroyed, a shard of every race is preserved within Shangri-La, the end of the world.
But the gods were too forgiving, thinking the races would be able to learn from the fact that they destroyed the world. They crawl out of their tombs to conquer Shangri-La and finally destroy everyone who doesn't follow.