Abyss

A realm that is so deep down that light cannot reach it. Some abilities allow one to enter or exit it.

History
Before the clouds were ripped apart, nothing much is known about it, except that it's existence was known of.

When the clouds were ripped apart, however, many of the people of the clouds refused to grab onto rays of light and fell into it. It is not known how many of them are still alive down there, nor how many instantly died from the fall.