Chu Qing was curious about weapons that could speak.
He wanted to study them and see whether he could combine talking weapons with those Mechanical Creatures that possessed little intelligence.
Unfortunately, according to the High Priest, such weapons were exceedingly rare.
Wu Feitu and the others:
The days passed one by one.
They released more and more creatures.
Moreover:
Most of the creatures they released had gone mad.
Only a small number, like Qiu Wudi's Heart, had retained their sanity.
But exactly how much sanity they still had was hard to say.
One year...
Five years...
Ten years...
Over the ten years Chu Qing and the others traveled through the Forbidden Zone under the Heavenly God's lead, they rarely dealt with the creatures of the Forbidden Zone.
The places they visited did not contain many powerful Forbidden Zone creatures.
At most, there were some Immortals, with the occasional Master making an appearance.
As for even stronger Forbidden Zone creatures, they had encountered none.
During that time:
Chu Qing had asked what level the most terrifying creature in the Forbidden Zone was.
The Heavenly God answered:
"The most terrifying one I know of is the fallen Heaven of the past."
"As for the others, I don't know."
That year:
Everyone released something that they did not know was an Ancient God and Demon or something else entirely.
After escaping its confinement, the creature looked at the sky, then ignored Chu Qing and the others and tore through the air as it departed.
However, before leaving, like the other creatures that retained their sanity, it left Chu Qing and the others with a piece of information.
That information contained the creature's cultivation experience.
Having reached their current level, simple secret teachings no longer had much effect on Chu Qing and the others.