Outside Yuan Magnetic Mountain, No.4 sat on the ground with his eyes closed, resting.
Inside the Seventh Floor, he saw Yu Ziqing's message, thought for a moment, and always felt that Sorrow Mountain sounded very familiar; he was certain he had heard of it before.
"I have heard of Sorrow Mountain, I need to go home and check the materials, and will get back to you in a while."
Yu Ziqing was also somewhat surprised when he saw the message.
He originally didn't expect No.4 to provide him with any intelligence. An adventurer who roamed around every day— if you asked him about the affairs of the Dali court, he would definitely be clueless.
He guessed No.4 might only know about things related to adventures, so he casually asked.
Unexpectedly, No.4 really had heard of it.
That meant one thing; the Grotto Heaven that Lei Yu was planning to explore was definitely not simple.
Grotto Heavens and blessed lands are resources that many major powers strive to control.
Many cave heaven blessed lands contain special products not found elsewhere: minerals, Spiritual Medicines, gems, demons, and other Living Beings, even ghosts and zombies, all of which can be considered resources.
For example, the core part of the Flying Boats produced by Sky Sect required certain minerals and gems that could only be mined from a large Grotto Heaven under their control.
However, Grotto Heavens and blessed lands aren't that rare; it's the ones that are of high value and suitable for development that are scarce.
Like the previous Jinlan Village, it could be considered a blessed land, but the only thing of value to outsiders was Jinlan Mine.
Before Langya Institute in Daqian had fully researched the use of Jinlan Ore, the ore was merely an expensive, low-yield product that could be completely substituted with cheaper minerals.
Furthermore, the alien power enveloping Jinlan Mountain essentially made it worthless for development.
Such blessed lands were the most common, every now and then someone would discover a new one.
The vast majority were of no use and had no developmental value, and if they were enveloped by alien power, their worth might be less than even a wasteland in the wild. At least some wastelands could be cultivated to grow something after development.
Blessed lands are generally smaller, but Grotto Heavens are often much larger and usually have complete water cycle systems. Some have even evolved their own unique Living Beings.
Grotto Heavens with developmental value are relatively more numerous, but their danger far exceeds that of ordinary blessed lands.
Besides environmental dangers, there could also be risks presented by the living or Dead Spirits within.
Overall, Grotto Heavens and blessed lands are not so rare.
Lei Yu's entanglement with a Grotto Heaven was because such protected Grotto Heavens are likely much more valuable than those free-for-all Grotto Heavens, where anyone can come and go as they please.
Similarly, because Grotto Heavens are not so rare, and there is so much junk among them, others are not very interested.
After all, those protected Grotto Heavens must have been left behind by predecessors.
Among these predecessors, there were many who were ruthless and had wicked tastes, enjoying causing harm for the sake of it, and such people were not few in number.
Specifically choosing an extremely dangerous Grotto Heaven, then applying all manner of protections and sealing the entrance, just to trap people.
This wasn't unheard of.
There were also predecessors who had no accompanying burial objects upon their seated transformation, but chose a Grotto Heaven as a Mausoleum instead, hence setting up a step with killing mechanisms and every ten steps as a deadly ground was a common practice.
Yu Ziqing was not very interested in Lei Yu's invitation to team up, for reasons related to the above.
At home, he daily took advantage of the strength of Jade Tomb for Body Refinement and Cultivation and in the blink of an eye, nearly a month had passed.
In Cultivation, there are no years; Yu Ziqing felt as if time passed like flowing water, slipping away in the blink of an eye.
Today, he finally received a message from No.4.
"The intelligence you're asking for is a bit complicated, a bit much, how about we meet to discuss?"
Yu Ziqing thought for a moment and entered the Seventh Floor.
No. 4 was already sitting in his spot, waiting.
"I don't dare boast about other matters, but if you ask about Forbidden Lands, Grotto Heavens, blessed lands, and the like, I am definitely more knowledgeable than others."
Yu Ziqing gestured with his hand for the other party to begin.
"In the Hengduan Mountains of Dazhen, there are many Grotto Heavens and blessed lands.
However, as for blessed lands, they are basically useless, all eroded by the earth Qi of the Hengduan Mountains, tainted with Cold Qi, not much different from the surroundings of the Hengduan Mountains.
Though there are fewer Grotto Heavens, they are generally places of absolute peril.
You should know, during the Ancient Era, before the establishment of Dazhen, Dali, and Daqian, it was very popular to use Grotto Heavens as one's mausoleum.
For those powerful beings, turning a Grotto Heaven into their eternal resting place was the most basic arrangement.
They would specifically look for Grotto Heavens that were inherently dangerous and would strengthen them before death, turning them into deadly grounds where death was certain and life was impossible."
Yu Ziqing nodded solemnly, signaling for No. 4 to continue.
He knew nothing about history.
The most he understood about the history of the past was actually from the memories he retraced of White Sun Holy Mother, and some of the things he had seen.
To study history and understand it thoroughly was not something that could be done in a short time.
"Originally, after I went home, I flipped through some material and asked the elderly at home.
It is almost certain that the Sorrow Mountain you mentioned does have a Grotto Heaven.
And the likelihood is high that it was the mausoleum of an Ancient Era powerhouse.
The protective barrier there is strong, connected to the entire Grotto Heaven's power, forming a whole. Forcefully breaking it could very well destroy the entire Grotto Heaven.
I'm not wrong, am I?"
Yu Ziqing nodded his head. Lei Yu had indeed mentioned this.