"These blueprints don't seem to belong to this civilization," Zhu Yanyi observed. "Many of these vehicles utilize energy sources."
"Products of the Fourth Civilization," Yan Aohan judged immediately after reviewing them. "I told you before: the Fourth Civilization was a true technological and energy-based society. Their people possessed extraordinary wisdom. Although they lost their innate spiritual abilities, their developed intellect allowed them to create advanced technologies. Ultimately, humanity perished due to a planetary war."
"You mean this Gusi Lan ruin originated from the Fourth Civilization?" Zhu Yanyi gasped. If that were true, the historical value of this site was immense.
"Don't forget the Hexagram. That belongs to the Third Civilization. So, this ruin is either a remnant of the Third or the Fourth." Yan Aohan glanced around. "Collect all these items later. You might find them useful someday."
After Zhu Yanyi stored the blueprints and models, Yan Aohan said, "Let's go to the central room. I wonder what surprises await us there."
The central room was the last one. It was empty except for a stone coffin and a jade box.
Yan Aohan opened the jade box. Inside lay a dark, wood-like object with faint patterns that did not belong to this era.
Within a few breaths of opening the box, a human figure appeared from within.
From his attire, it was clear he was neither modern nor from the ancient times of this world. However, his majestic aura indicated he was an emperor from ancient times.
"King of Gusi Lan," Yan Aohan identified him at a glance.
The King of Gusi Lan spoke, surprisingly in Chinese: "Greetings, children who opened the jade box. I am An, the great King of the Gusi Lan Empire. I left this shadow box to record the existence of our great empire.
Currently, I am the only one left in this underground city.
I deeply regret my greed and dissatisfaction with the status quo, which led to the disappearance of my empire. I have become the greatest sinner of Gusi Lan.
My heart aches with pain; this is all my fault.
In my quest for immortality, I listened to the sweet words of a black witch and built this Hexagram city.
I never imagined this would trigger the magic array of the Third Civilization. I never thought there was a magical formation beneath the palace of my great Gusi Lan Empire.
I deeply understand that magic cannot exist in this world, for its emergence would lead to the world's destruction. Therefore, I am filled with remorse and repentance for my actions. I decided to seal this place using my abilities.
However, once the seal is broken, the Gusi Lan Empire will perish completely. The only thing I could do was leave this shadow box to record our existence.
Now that the shadow box is open, all the wealth of this city is yours. I hope you, my children, will be happy. The way out of this underground city is…"
After the King of Gusi Lan finished speaking, he vanished. Zhu Yanyi looked at Yan Aohan with a blank expression. "I didn't expect the King of Gusi Lan to be one of our Chinese people. If that's the case, shouldn't this W Country also belong to China?"