The Calamity

The Calamity refers to an ancient invasion of the world of "Ascension of the Immortal Asura" by foreign entities and the subsequent war for the world's survival.

History
Many hundreds of thousands of years ago, the world was at its very peak of existence. Suddenly, a foreign race of immensely powerful beings invaded the world and nearly destroyed it. Only the combined might of the world's most powerful cultivators, including the ruler of the world at the time, was able to turn the ties of the war, managing to just barely repel the invasion.

Impact
Unfortunately, the victory was a pyrrhic one. The damage that the world sustained from the war effectively sent it into a dark age. It has taken hundreds of thousands of years for the cultivators of the world to begin to claw their way back with hopes of eventually reaching the level of power that the world knew in its heyday.