"They don't know. Or at least no one who lived on any of the spheres understood why it happened at the time. It was sudden and brutal and violent. But they all had to learn how to live with the result."

Some of them didn't live with the result. Some were slaughtered by each other, which is unsurprising, given the nature of living beings. He has seen no text where they talked about an event that caused it, which was certainly frustrating to them at the time. No answers for why their world was permanently changed and scarred.

"But I recently discovered that the monoliths aren't scars, they are gateways. All the other spheres weren't destroyed or abandoned as we thought, they were merely cut off. There may be much information that was lost."

Like perhaps the monoliths existed before the Conjunction. Or maybe someone did create them and put them in place for an invasion later. He doesn't know. Princess Cirilla is the only person he knows that is capable of using them, but that is private information.

"I think the Singularity and the monoliths are connected."