A bold guess suddenly appeared in Wang Lin's mind. One day, many people were sitting at a table when a disaster suddenly befell them. Without them noticing, the entire city turned into a deathly silent ruin.
At this time, a cold aura gradually emitted from the ruins. This aura became heavier and heavier until it almost solidified into a solid substance.
"Looking at the scale of this ruin, I'm afraid the population is no less than 10 million. A place with 10 million dead people should be the best yellow type extreme Yin land among the four lands."
Situ Nan once explained in detail to Wang Lin when he was in seclusion.
Extreme Yin lands were divided into four types: Heavenly Yin, Earth Yin, Profound Yin, and Yellow Yin.
Yellow Yin land was the simplest. A place with a large number of dead people was a Yellow Yin land. The more dead people there were, the better the Yellow Yin land.
Profound Yin land was a bit difficult. Most of them would only appear in extremely cold places.
Earth Yin was even more difficult. It required great luck to encounter it. After all, the so-called Earth Yin was the aura emitted from the abyss below.
As for Heavenly Yin, it was basically impossible to appear. To form a Heavenly Yin land, one must have Earth, Profound, and Yellow Yin at the same time. Only then would it produce a wonderful transformation and become a Heavenly Yin land.
The higher the quality of the extreme Yin land, the more benefits it would bring to the cultivator.
Wang Lin immediately formed a hand seal with his right hand and muttered something. Suddenly, red light spots condensed in front of him and formed a red ball of light.
This was a spell specially used to test the quality of the extreme Yin land. According to the color of the ball of light, there were four kinds of light: purple, blue, silver, and red. They each corresponded to the four great extreme Yin lands of heaven, earth, profound, and yellow.
In addition, Situ Nan had also mentioned that even different places of extreme yin were divided into four levels: Ordinary, Superior, Heavy Yin, and Extreme Yin.
Each level was divided into ten grades.
Generally speaking, ordinary grade three and above could be used to cultivate the Netherworld Ascension Method. Ordinary grade eight and above could speed up the cultivation speed.
After the ball of light appeared, it suddenly emitted a strong red light. The red light became brighter and brighter. Finally, it flashed five times.
Wang Lin touched his chin. His eyes flashed. He knew that flashing five times meant that the quality of the yellow yin land was ordinary grade five.
After pondering for a while, he controlled the ball of light and walked into the ruins.
As Wang Lin walked in, the surrounding cold aura became thicker and thicker. In the end, he even felt as if he was walking in water. This aura was too heavy. Just walking a few hundred feet, he already felt like he was suffocating.
This time ball grew brighter and brighter as Wang Lin walked, reaching the level of an ordinary eighth stage.
Wang Lin didn't stop and continued forward. After walking another few hundred feet, he arrived in front of the stone bead's remains. He couldn't go any further. The cold Yin Qi drilled into his body, and his blood vessels began to hurt. His spiritual energy also showed signs of going out of control.
At this moment, the red ball split into two with a bang. Both of them flickered. Wang Lin's eyes flashed. He knew that this meant that the quality of this place had reached the first-grade.
According to Wang Lin's search of the ruins during the day, he knew that the ruins were huge. His current location was probably not even one ten-thousandth of it.
Furthermore, the deeper they went, the denser the Yin Qi became.
"This is definitely the best place to train!" Wang Lin slowly retreated and stopped at the spot where he was at the fifth-grade.
This was the place Wang Lin thought was the most suitable for his body. The Underworld Ascension Method's requirement for Yin energy had to be increased step by step. This was something Situ Nan told him before he went to sleep.
Wang Lin thought for a while and sat down in a lotus position. He closed his eyes and pondered. Situ Nan's detailed explanation of the Art of Underworld Ascension echoed in his mind.
The Art of Underworld Ascension was divided into nine levels. Every three levels allowed the cultivator to form a cold Dan. Once all nine levels were cultivated, the three cold Dans would fuse together and there would be a chance that the cultivator would reach the completion stage.
This was the main reason why Wang Lin decided to cultivate the Art of Underworld Ascension. It was also the most suitable and faster method for Wang Lin out of all the methods that Situ Nan knew.
Of course, there were faster methods such as the Dan Stealing Technique. However, for Wang Lin, capturing a completion stage cultivator alive was the same as suicide.
The cold Dan of the Art of Underworld Ascension was formed by breaking through the orifices. This was a process that must be experienced to cultivate this technique. The Art of Underworld Ascension had three major orifices: the dantian, the Sea of Qi, and the Ancestral Orifice.
The moment these three orifices were broken through, the cold Dan would form.
Once the cold Dan appeared, the spiritual energy in the body would change and turn into Yin energy.
As for the success rate of breaking through the orifices, it had a lot to do with the quality of the Yin Qi.
Time passed quickly. When he opened his eyes again, the sky was getting brighter. The Yin Qi around him quickly dissipated. The moment the sun rose, the Yin Qi disappeared.
Wang Lin stood up. Since he had decided to cultivate here, he had to find a place to live. He looked around and set his sights on a collapsed house not far from where he was.
With a wave of his right hand, the debris and rubble all floated into the air and cleared out a small empty space.
After everything was done, Wang Lin quietly sat cross-legged in the empty space. He took out a thread-bound book from his bag of holding and carefully flipped through it.
This book was the book that he bought two years ago in Teng Family City with a medium quality spirit stone.
At that time, he took a quick look at it and found that there were detailed descriptions of several formations. There were also diagrams and all kinds of formations that were very comprehensive.
After memorizing all of the contents, Wang Lin closed his eyes and pondered. His hands occasionally moved as if he was drawing something with his divine sense.
One day quickly passed. At dusk, Wang Lin let out a sigh, opened his eyes, and muttered to himself, "This formation is very profound. Even though the small formations in this booklet are very simple, it took me an entire day to barely understand a thing or two. Some of the derivation techniques in there focus on the power of calculation. The further I go, the more difficult it becomes."
Helplessly, he stopped thinking about it and followed the diagrams in the book. As he fumbled around, he used the attraction technique to pick up stones and placed them outside the room.
Just like that, he finally set up a formation called Little Disorientating Footprints.
This formation was too rough and simple. It didn't even have a flag. Looking at the scattered stones outside the room, Wang Lin bitterly smiled. He carefully compared it with the diagrams and made some adjustments. Finally, it matched the requirements of the diagrams.
Wang Lin took a deep breath. His hands formed a spell according to the instructions and quickly pointed. Suddenly, a fog appeared silently and surrounded the surroundings.
Wang Lin looked at the fog and smiled bitterly. This formation was more than enough to trap some mortals. However, for cultivators, it was useless and couldn't achieve its purpose of protecting them.
After pondering for a while, Wang Lin muttered to himself, "If one formation isn't enough, I'll set up two. If that doesn't work, I'll set up all the diagrams in the book. That way, it will more or less have some effect."
Thinking of this, Wang Lin used the attraction technique again to control the stones around him. After setting up a few more diagrams, night fell again.
Wang Lin sat cross-legged on the ground. The moment the cold Yin Qi rose, he suddenly placed his hands on his knees and focused on breathing.
His breathing was in the form of one long and five short.
The so-called one long meant that he took a long time to breathe in. As for the five short, it meant that the time he took to breathe out was only one-fifth of the time he took to breathe in.
He was using the fastest speed to absorb the surrounding cold Yin Qi into his body.
Strictly speaking, this was the first time he had breathed in the outside world after inheriting his foundation. In the past two years, he had been absorbing spiritual liquid and digesting it internally.
This cold Yin Qi was actually the same as spiritual energy. Wang Lin had cultivated spiritual energy for many years, so he was very familiar with it. However, he immediately noticed something was different. In the past, when he breathed in and out, there seemed to be a thin membrane around his body that prevented him from breathing in and out. Not only was the speed at which spiritual energy entered his body slow, but he could also only absorb a portion of it. Most of it would disappear as he breathed in and out.
However, it was different now. It was as if the thin membrane had disappeared. The moment he breathed in and out, the cold Yin Qi flooded into his body.
Moreover, it was as if his body had changed. He had absorbed more than half of the cold Yin Qi. It was completely different from before.
Wang Lin pondered for a bit and came up with three answers. First, the cold Yin Qi was different from spiritual energy, so it was more suitable for him to breathe in and out.
Second, after reaching the Foundation Establishment stage, his breathing speed was much faster than when he was at the Qi Condensation stage.
Third, after absorbing part of Teng Li's spiritual root, his talent had increased by a lot.
As for which answer was correct, Wang Lin didn't think too much about it. Instead, he immersed himself in breathing in and out.
At the beginning, Wang Lin wasn't used to it because the Yin energy's attribute was very cold. After he absorbed it, it immediately entered his body and entered his internal organs. The coldness that spread out from his body caused his body to tremble.
This feeling was the complete opposite of absorbing spiritual energy. One made his body feel warm and comfortable, while the other made him feel like he had entered an icehouse.
As he breathed in more and more of the cold Yin Qi, Wang Lin's hands and feet became cold. The blood in his body became more and more viscous. In the end, even his heartbeat slowed down.
Frost appeared on his eyebrows, hair, and all the pores on his body. A cold Yin Qi came out from his body and perfectly merged with his surroundings.
Time quickly passed. When the sun rose, the cold Yin Qi dissipated. Wang Lin's eyelids trembled and he opened his eyes. He let out a deep breath of white air. After a night of breathing, a small ball of air appeared in his abdomen. This ball of air slowly rotated and released a trace of cold Yin Qi.
The spiritual energy in his body didn't reject this ball of air at all. They didn't interact.