Negary had managed to discover a few things about the ancient era of this world from its archeological records.
This world's archeological society believed that before humans were born, there was another sentient race who ruled over the world.
However, history had already been cut-off, which resulted in most of that era being a complete mystery. The only thing that could be confirmed was that a certain war caused huge geological changes.
The archeological society of this world came up with countless theories, while Negary simply used the formula and current coordinates provided to him of the other world to calculate, thus finding out that the time of the war was exactly when the two worlds intersected for the third time.
A war had broken out between these two worlds, this was Negary's conjecture, which meant that his treatment when he travelled to that world through the [Otherworld Invasion] Authority would be a mystery.
