So Gu Yan pushed the old man's body over and found something that looked like a flag under the seat. This must be the soul-summoning banner he was talking about.

Gu Yan immediately concluded that the black jade stones on it must have floated out from this soul-summoning banner.

"This is an ominous object. And what's this about using souls to nourish a banner? Does it mean I have to kill people? But it doesn't say how to use it," Gu Yan said speechlessly.

He had just used his third eye to look inside when he found it blocked. So he cut his hand again, dripped a few drops of blood, and it instantly melted into the wound. He then added more blood.

Then he clearly felt a connection established with the soul-summoning banner.

With a glance from his divine eye, he discovered that there was a hidden world inside, but it was completely dark and empty.

So he put the Soul-Summoning Banner into his storage ring. He used his Heavenly Eye to examine the corpse and found a round thing in its lower abdomen. He originally wanted to use a dagger to dig it out, but the corpse was too hard, and the dagger broke in two. So he took out the Soul-Summoning Banner and used its handle to poke a hole in the corpse's abdomen, and the round thing rolled out.

He shone his flashlight on it and examined it with his Heavenly Eye. Could this be the Core Formation he was talking about?

The pill had many cracks, but Gu Yan could still feel the surging power within it. Suddenly, he felt the golden egg in his stomach move, just like when he first encountered that piece of glue. Gu Yan immediately knew that this must be a treasure.

He took out a gourd and poured out a few feed insects, but then found that although they were wriggling hard, they seemed unable to burrow inside.

The golden egg in his stomach trembled again, causing Gu Yan's face to contort in pain, and the pill instantly flew into his mouth.

"Ouch...it hurts!"

Gu Yan felt the pill rush straight down to his stomach, causing him to writhe in pain. With great effort, he used his Heavenly Eye to examine it and discovered that the pill had stuck to the golden egg, and its energy was flowing into the golden egg.

Before long, the pill was absorbed by the egg, which seemed to be about to break out of its cocoon.

Gu Yan uncontrollably took out the silvery-white stone and held it in his hand, immediately feeling as if the stone was drilling into his hand.

The golden egg was also vibrating, as if it were about to leave his stomach. The two kinds of pain, one inside and one outside, caused him to faint.

When he woke up, he was soaked in sweat, the stone was gone, and he could only feel unbearable pain all over his body. He quickly used his Heavenly Eye to investigate and found that the golden egg was gone.

He then noticed the wound on his left hand that looked like it had been stitched together, and discovered a new space inside. He then used his third eye to probe and suddenly discovered a golden cocoon.

So, with a single thought, Gu Yan moved the golden cocoon out and held it in his hand.

"I can actually manipulate this space at will, which means I don't have to worry about those feeder worms filling my stomach anymore?" Gu Yan finally felt a little better.

Although he was in pain all over, it was worth it; the problem that had been bothering him for so long was finally solved.

"It seems that was just the egg's instinctive reaction," Gu Yan thought to himself.

He poked the cocoon. He found it motionless, as if it were really dead, so Gu Yan put the corpse into his storage ring.

I was thinking, what if it comes in handy later? Anyway, I can't waste it. I'm his successor, so I shouldn't be so stingy.

Gu Yan thought to himself.

Gu Yan then left the mine, intending to go back to the original hotel to properly digest the books. As he walked, he suddenly saw a group of warlord soldiers patrolling, a total of ten people, like a small squad.

So Gu Yan decided to test the soul-summoning banner he had just used. He picked up ten small pebbles and threw them directly at their necks, killing them instantly. Then he took out the soul-summoning banner, walked over and shook it at them. Immediately, he felt ten transparent things enter the banner.

Gu Yan used his Heavenly Eye to look inside and indeed saw ten souls floating there. Moreover, he felt he could control them at will, and Gu Yan was delighted. "Isn't this just adding a bunch of henchmen?" he thought. "Although their strength is somewhat weak, they should be able to intimidate me, right?"

So he tried the crack on his left hand again. With a thought, the ten corpses vanished instantly. Then, Gu Yan used his Heavenly Eye to look at the space, and all ten corpses reappeared inside. Now he could eat without restraint without worrying about overeating.

Let's call it the "Insect Breeding Space" from now on.

Gu Yan was in a very good mood. After returning to the hotel, he rented another room, took a shower, and went to bed. He took out the books and used his Heavenly Eye to look at one of them, which was a diary. Gu Yan then prepared to use his Heavenly Eye to analyze the contents.

About half an hour later, Gu Yan withdrew his Heavenly Eye, feeling a little excited because it contained knowledge about cultivating immortality.

It turns out that everyone may have a spiritual vein within their body. If it is a single one, it is the legendary Heavenly Spiritual Vein. It is said that there are very few people with this vein, but as long as they do not perish, they will surely become a great power in the future.

Slightly less common are dual spiritual veins, which are also extremely rare in this world. There are also triple spiritual veins, quadruple spiritual veins, and useless spiritual veins, as well as some special spiritual veins with attributes.

Without spiritual veins, one cannot comprehend spiritual energy. Only by comprehending spiritual energy and storing it in one's dantian can one be qualified to become a cultivator.

The first realm is called the Spirit Opening Realm, which means opening the spiritual meridians in one's body. There are ten levels in total. If one can reach the tenth level, one can live for at least one hundred and fifty years.

Gu Yan sensed the energy in his dantian and found it to be around the second level. Gu Yan also learned that his Heavenly Eye was actually called Divine Sense.

According to the diary, only those who reach the third level of genius have a chance to condense divine sense. Gu Yan couldn't help but feel curious; could he be the legendary Heavenly Spirit Vein?

The second realm is the Spirit Sea Realm. It is said that upon reaching the Spirit Sea Realm, one's divine thoughts will transform into divine consciousness. At that time, one's thoughts can be clearly perceived within a radius of several miles. Most importantly, one's lifespan is three hundred years.

However, it was too far away from him. He was only at the second level of cultivation, and there were several thousand stones in his storage ring, which should be spirit stones. However, he felt that there was very little spiritual energy in them, probably due to improper storage. It is said that absorbing spirit stones can increase cultivation speed.

So Gu Yan took out a stone that shimmered with a purple light and placed it in his palm. He then sat cross-legged.

Gu Yan felt the spiritual energy from the spirit stone enter his body, and in less than a minute, he felt that the stone in his palm had lost all its spiritual energy.

His cultivation had only improved slightly, so he took out over a hundred more stones to absorb. After more than an hour, there were about a hundred pieces of discarded spirit stones on the ground, and he felt that the gas in his dantian had grown even stronger.