Indifference

The Mortal Plane was in turmoil. 

Many weren't certain of exactly what happened. On one day, they were in the deep lull of peace, but in the next, it felt as though the world was collapsing all around them. The difference was striking and jarring. 

Void beasts ravaged the lands. At first, there just seemed to be one or two. However, with each that fell beneath the combined assault of the Sacharro Royal Family, another would appear. Soon, the hordes became too much to deal with and mortal cultivators were forced to seek refuge within the walls of the Mortal Empire. 

It could only be said that the defensive design of the Mortal Empire was the best to ever appear on the mortal plane. Not only were their universes arranged such that one could only access at most two others from a single point, each of them was incredibly difficult to navigate.