Had they been invaded by a suspected Outer Realm Civilization thirty years ago?
Now, aside from the universe containing the capital planet and the universe between it and the Peiton Universe, every other universe of the Tri-Union Civilization had fallen.
And apart from the First Legion defending the capital planet, every fleet had been wiped out?
That bad?
Still, that explained why the Tri-Union Civilization had made no moves for decades after its defeat in the Peiton Universe, not even deploying fleets to defend its borders.
Outer Realm Civilization.
Lin Fan was no stranger to that term. After Luo Li returned, she had explained to him the basics of Black Hole Cavity Space.
Within Black Hole Cavity Space, there existed a special barrier known as the realm wall, which divided the entire space into countless sections.
Thus, an Outer Realm Civilization invasion referred to an invasion by a civilization from another realm that had forcibly crossed a realm wall.
Generally speaking, such things rarely happened.
After all, crossing a realm wall was not something an ordinary civilization could accomplish.
Of course, civilizations like the Black Church, which had the help of the Black Hole Cavity Consciousness and could cross realm walls at will, were another matter entirely.
Luo Li did not know how many so-called realms currently existed within the Black Hole Cavity.
That number was not fixed. Just as the universe was constantly expanding, so was the Black Hole Cavity. As Black Hole Cavity Space expanded, several new regions were born roughly every hundred million years.
In short, at the height of the Great Xia Federation, it had ruled over more than thirty realms. Based on estimates, the total number of realm regions within Black Hole Cavity Space should have been no fewer than three thousand.
In other words,