This was a huge karst cave, the cave was surrounded by countless small holes, Wang Lin's Divine Sense entered from one of them.
In the center of the karst cave, there was a huge coffin, this coffin looked very ordinary from the outside, it didn't even have any decorative patterns, but the majestic Yin Qi was rapidly emitting from the coffin, turned into a burst of white gas, and was absorbed by the small holes in the surrounding walls.
Wang Lin hesitated for a moment, his Divine Sense observed around the coffin for a long time, and then immediately probed inside, to Wang Lin's surprise, there was not the slightest obstruction, and he went in.
The coffin was empty, but there was a big round hole at the bottom, from which the Yin Qi was emitting.
The Yin Qi here was quite thick, turned into layers of waves, and prevented Wang Lin's Divine Sense from exploring.
In the cultivation room where Wang Lin was, his eyes flashed a decisive color, in order to figure out the mystery of the Yin Qi here, to figure out why the stone bead would absorb the Yin Qi here, he didn't say a word, slapped his storage bag, took out the Yin Qi Dew Gourd, and drank a small mouthful.
With Wang Lin's current body, he still couldn't help but shiver, his body was cold, and soon he lost consciousness, becoming numb. Wang Lin didn't waste any time, immediately began to circulate his spirit force, and as he breathed, his Divine Sense became more solid, with a steady supply, his Divine Sense was like an awl, fiercely piercing into the hole in the coffin.
His Divine Sense was difficult to enter the hole, and several times it was almost scattered by the Yin Qi. When it sank to about 400 feet, the Yin Qi reached the limit, and once again formed a "door".
Wang Lin gritted his teeth, fiercely drank a big mouthful of Yin Qi dew, and then his Divine Sense rushed in, breaking the door. The moment he entered, Wang Lin was shocked by the scene in front of him.
A huge naked man's corpse, floating in the air, if compared, Wang Lin was only the size of this corpse's finger. On the corpse, there was a kind of purple and blue plant, these plants were wriggling all the time, and as they wriggled, the giant's body obviously shrank, but then returned to normal, this cycle, cycle, cycle, the Yin Qi quickly emitted from the plants.
Wang Lin was stunned for a moment, and carefully checked with his Divine Sense, the more he looked, the more shocked he was. This huge corpse was obviously deliberately left here, the purpose was to become the purple and blue plant nutrients.
Obviously, the answer to why Shiyin had the Yin Qi of the Earth grade, was these purple and blue plants.
Even the evolution of the heaven defying bead must have a great relationship with these plants.
After observing for a long time, Wang Lin slowly withdrew his Divine Sense, this place was extremely strange, after Wang Lin entered here, he had a faint sense of danger.
Just as he was about to leave, suddenly, a murmur seemed to come.
Without saying anything, Wang Lin immediately withdrew his Divine Sense, but what surprised him was that the Yin Qi suddenly rolled, blocking his Divine Sense, at this time the murmur was getting closer, Wang Lin could already vaguely hear the content.
"Save me …"
Wang Lin decisively picked up the gourd, and drank the liquid inside in one gulp. His Divine Sense immediately shook, and fiercely drilled into the surrounding Yin Qi, an unimaginable cold immediately drilled into his Divine Sense, intertwining with the Yin Qi that Wang Lin had not digested yet. Wang Lin's face paled, and he spat out a mouthful of blood, the blood had already turned into ice crystals.
Even so, his Divine Sense finally broke through the obstruction, and quickly withdrew into the cave, returning to his body in the blink of an eye. Wang Lin's body turned cold, and he once again spat out a few mouthfuls of blood crystals, his face revealed an aghast expression.
He did not dare to probe again, and immediately breathed in and out to calm the Yin Qi in his body. After a long time, he slowly opened his eyes, and with a lingering fear, he looked at the small holes in the walls around him, and remained silent.
Time slowly passed, and in the blink of an eye, Wang Lin had already been in Shiyin for four days. In these four days, besides the three days when his Divine Sense entered the ground, he did not do anything else. Every day, he spent most of his time collecting the liquid on the bead, and the bead had also increased from two leaves to three.
According to Wang Lin's calculations, the total number of leaves on the bead should be the same as the previous cloud, ten. Moreover, with the previous experience of adding clouds, Wang Lin knew that the further he went, the slower the number of leaves would be. If he only used the Yin Qi here to nourish the bead, then he was afraid that it would take several years for the wood attribute Spiritual Qi to reach perfection.
However, Shiyin was not a place to stay for long. After thinking for a long time, Wang Lin decided to explore the underground giant again, and this time, he would strive to find a path that would allow his body to enter. In this way, he could personally go down and grab a few purple-blue plants, and he would definitely be able to make the stone bead evolve crazily.
However, this was too dangerous, and Wang Lin was a bit hesitant.
After thinking for a while, he decided to give up on the idea of personally going down. He knew that with his current cultivation level, no matter how careful he was, the chances of obtaining the purple-blue plants were not very high, and it was very likely that he would lose his life. Comparing the two, Wang Lin naturally had a choice.
After making up his mind, Wang Lin slapped his bag of holding and an ancient sword sheath flew out and floated in front of him.
Ever since Wang Lin obtained this sword sheath, he had only refined it once after stealing Teng Li's foundation. Although he didn't succeed, he more or less knew how to use it. The effect was not the best. Up until now, the most he could do was make the flying sword sink down to three fifths of the way down.
As for this sword sheath, Wang Lin had studied it for a long time. Even Si Tu Nan had said that this sword sheath was very strange, and its value far surpassed the small green sword.
"Sun Hao said that this sword sheath and sword sheath were found in an ancient cave by his master. Other than his master, no one below the Core Formation stage can refine them.
There should be some truth to this. It's not that these two items cannot be refined, it's just that it takes too much time and spiritual energy to refine them. If one succeeds in the Core Formation stage, using the Dan Fire, this process can be greatly shortened.
Sadly, the blood refining technique can only be used on one item. If I could use it on the sword sheath, then everything would be much simpler. "Wang Lin's eyes flashed as he thought to himself.
Wang Lin didn't even blink as he stared at the sword sheath. In order to increase the power of the flying sword, he had to try refining the sword sheath again. Wang Lin pondered. Although he didn't have a golden core, he had the cold core he obtained from cultivating the Underworld Ascension Method.
All of the cold spiritual energy in his body was focused on the cold core. He had been studying it for a while now. However, after Si Tu Nan finished talking about the Underworld Ascension Method, he seriously told Wang Lin that the difference between a cold core and a golden core was huge. The most obvious difference was that unless it was absolutely necessary, the cold core shouldn't leave the body. Otherwise, the cold core would immediately dissipate and he would need to cultivate again.
The first time he refined it, he had just succeeded in obtaining his foundation. However, after cultivating the Underworld Ascension Method, not only had the spiritual energy in his body changed, but his cultivation had also reached the peak of the early stage of Foundation Establishment. He could break through to the mid stage of Foundation Establishment at any time. Therefore, refining the sword sheath should be easier than before.
Thinking about this, Wang Lin opened his mouth and spat out a mouthful of cold, blue spiritual energy. The moment the spiritual energy touched the sword sheath, it immediately turned into layers of frost and wrapped around the sword sheath in the blink of an eye.
Wang Lin pointed with his right hand and the sword sheath slowly rotated in the air. Traces of blue light came from it, making it look very beautiful.
Wang Lin's hands didn't stop as he shot out rays of blue light. Every time the blue light hit the sword sheath, it would tremble. Gradually, Wang Lin's hands moved faster and faster. The rays of blue light that were filled with spiritual energy almost formed a straight line. The frequency at which the sword sheath trembled increased without any pause.
A large amount of sweat appeared on Wang Lin's forehead, but as soon as it appeared, it was frozen into ice beads and fell to the ground.
As for these things, Wang Lin didn't have time to worry about them. He stared unwaveringly at the sword sheath and shot out a few more rays of blue light. He quickly slapped his bag of holding and a gourd appeared in his hand. After drinking a mouthful, he continued to refine the sword sheath.
Time slowly passed. After the sword sheath continued to tremble for a long time, the blue light on its surface flickered. Slowly, a pentagonal pattern appeared on the sword sheath.
Seeing this pattern, Wang Lin let out a sigh of relief and stopped shooting out blue lights. He adjusted the spiritual energy in his body and thought to himself, "My cultivation is almost five times stronger than before. Before, I used the method that Situ Nan taught me to use spiritual energy to force out the formation inside the sword sheath. In total, I shot out more than five thousand rays of spiritual energy. In the end, I was exhausted and didn't have the energy to continue refining. But now, after shooting out one thousand rays of spiritual energy, the formation has already appeared.
Although my cultivation has increased a lot, it is still too far away from the Core Formation stage. Situ Nan once said that a Core Formation stage cultivator only needs a few rays of spiritual energy to force out the formation. "
Taking a deep breath, Wang Lin's right hand formed a seal and pointed at his lower abdomen. Suddenly, his chest contracted and his face revealed a painful expression. His right hand slowly moved up from his abdomen and opened his mouth. A blue cold core the size of a baby's fist floated out of his mouth.
Wang Lin's face was extremely pale. After taking a few breaths, he immediately pointed at the cold core. Suddenly, the cold core melted at a speed visible to the naked eye and turned into a pool of blue liquid. At this moment, Wang Lin's face was even paler than before. There was not a single trace of blood on his face, but his face revealed a serious expression. He carefully controlled the cold core that had turned into liquid and slowly seeped into the sword sheath.