When you stare into the abyss, the abyss stares back at you.
The same principle applied to the ancient civilization hundreds of millions of years ago.
To collect astronomical amounts of information, Zero had set up an information transmission system in an artificial orbit around the original Chaos planet. The long-distance system was extremely advanced, and it could cross four-dimensional space.
However, the Phantom used the system to easily locate the ancient civilization's origin planet. It even discovered Zero's largest computing hub in the three-dimensional universe.
When Zero invested most of her computational ability into the various Chaos planets and massacred the primitive life forms there, she was shocked.