Tang San discovered that the variation in his back wouldn't consume too much of his soul power, as if there was a certain amount of energy stored within those vertebrae themselves.

  With the bulge of eight drum-like packages, the purple light that appeared on Tang San's back also became more and more distinct.

  Suddenly, with Tang San's body shaking violently, the eight drum-like protrusions finally burst out of his body. Eight thick, purple pillar-like objects rapidly extended from his back.

  If Tang San's companions from Shrek Academy were here at this time, they would definitely find that the speed of the spider legs growing out this time is much faster than last time.

  In the blink of an eye, the sturdy spider legs had already stretched to a length of one and a half meters. Suddenly, the spider legs expanded rapidly, and from the end joint of the one and a half meter long sturdy spider legs, another one and a half meters in length suddenly popped out, revealing the sharpest part.

  Tang San couldn't help but let out a low growl, the eight spider legs behind him stretching out to either side of his body, a purple glow flashing, just like eight giant arms protecting his body in the middle.

  On the spider's legs, a faint purple gas can be seen floating on top, with purple light flowing and turning, as if it were transparent amethyst.

  "Good." The master praised. "Xiao San, control your spider legs to pierce a big tree, use force."

  Tang San was still quite unfamiliar with his Spider Legs, but he could still manage to pierce a tree trunk. With a slight shift of his body, one of the spider legs on his left side suddenly shot out.

  With a "poof" sound, Tang San was shocked to discover that the spider leg had easily pierced through the tree trunk, which required one person to wrap their arms around it, and emerged from the other end.

  An even more astonishing scene was yet to come. As the spider leg pierced, Tang San and the master clearly saw a layer of purple color quietly spreading from the spider leg, transmitting at an astonishing speed throughout the tree body.

  Not only did the trunk quickly turn purple, but in a short while, even the buds and leaves turned into the same color.

  One by one, the leaves fell from the sky, but before they even hit the ground, they had already turned into a mist of purple powder and vanished. The large tree itself was like melting ice and snow, quietly turning into a purple dust that dissolved away. Even the underbrush on the ground near the tree, which had come into contact with this purple powder, successively disappeared after being dyed purple. Within an area of several meters in diameter, everything had turned into a silent expanse of purple death.

  A faint energy flowed into Tang San's body through his spider legs. Although the energy was not much, it was extremely clear.

  The last time, after Ma Hongjun was poisoned by the spider leg, Tang San also had a similar feeling, only that time it was much milder, and he didn't pay much attention to it. This time, however, it became extremely obvious. It was as if the spider leg absorbed the energy contained in the big tree and then transmitted it into Tang San's body.

  The purple powder that had fallen to the ground gradually turned colorless, and in a short while it had mixed with the mud, making it impossible to see. The large tree from before was as if it had never existed. Tang San's spider legs were still maintaining their previous movement, but there was nothing there.

  "This, this is actually..." Tang San stared blankly at the spider leg. Although he had already guessed that the spider leg's attack power would be good, but he didn't think that the poison attached to the spider leg would be so terrifying.

  The master slowly walked to Tang San's side, avoiding his spider legs. "It seems my judgment was correct. Little Three, what you gained the most this time is not the third soul ring, nor is it the third soul skill Spider Web Restraint, but these eight spider legs. Or rather, it's this external soul bone."

  "External Soul Bone?" Tang San looked at the Master.

  The master nodded, "All these years I've been teaching you how to distinguish between soul beasts and soul rings, as well as the cultivation methods of martial souls and various applications. Never mentioned anything about soul bone knowledge. This is mainly because I never thought you'd be able to come into contact with soul bones so soon. Looks like now it's time for me to tell you about the secrets of soul bones. Speaking of this, first need to say what are soul bones."

  Under the master's guidance, Tang San controlled his soul power to withdraw the eight spider legs into his body. Just like last time, these spider legs consumed a lot of Tang San's soul power when they were withdrawn, which was in stark contrast to when they were released without consuming any.

  "The Master said: 'The Soul Bone is an extremely special thing, or rather, it's the most desired item in a Soul Master's dreams. Similar to the Soul Ring, the Soul Bone also originates from Soul Beasts. However, it has huge differences with the Soul Ring. Firstly, the probability of a Soul Bone appearing is only one in a thousand, or even lower. Generally speaking, only extremely powerful Soul Beasts that experience special circumstances at death may produce a Soul Bone after dying. Not every Soul Beast will produce a Soul Ring like this. Therefore, the Soul Bone becomes extremely rare and precious.'"

  Another difference between Soul Bone and Soul Ring is that it doesn't require the person who killed the Soul Beast to use it, unlike Soul Rings. Even after obtaining a Soul Bone, it can be sold. Do you still remember what I told you before? I said you should accumulate as much money as possible so that in the future, you can buy the Soul Bones you need in some special places. Any piece of Soul Bone, no matter how ordinary, is priceless. And yet, it's something that has a price but cannot be bought.

  Tang San asked: "Then how should the soul bone be used? Do you mean that these eight spider legs on my back are eight soul bones?"

  After hearing Tang San's words, the master couldn't help but laugh. "You're not greedy at all, with eight soul bones, having one soul bone is already extremely lucky. Let alone this is an external soul bone, its preciousness can almost be compared to that of a top-level soul bone. This external soul bone of yours is a spine. Of course, it also includes the eight rib bones. Its effect is to store all the toxic fluids of the human-faced demon spider that killed you and replicate its eight spider legs, then combine them with your own abilities, evolving into these eight spider legs."

  "The Human-Faced Spider Soul Ring combines with your Martial Soul, enhancing various aspects of your physical body. The toxicity of the Blue Silver Grass has also increased significantly. However, that's still not the same as the actual toxicity of the Human-Faced Spider itself. But your eight spider legs are different; they not only possess the Human-Faced Spider's toxin but have also undergone a certain degree of mutation. You saw its incredibly powerful corrosive effect earlier. If this were to pierce human flesh, what would happen?"

  The master said up to here, his whole person seemed somewhat excited, "Xiao San, I ask you, a soul master can get the most how many soul rings?"

  Tang San said: "Nine. Getting nine is the limit, that's the Title Douluo."

  The master nodded, "In that case, when everyone has nine soul rings and the age difference is minimal, how do you decide who is stronger?"

  Tang San thought for a moment, saying: "It depends on what kind of martial soul each side has, whether there's any restraint, and also the comparison of their actual combat experience. Only by combining these factors can we determine who is stronger."

  The master nodded and said, "What you said is correct, you remember the things I taught you very clearly. So, now I can tell you that under equal conditions for both parties, if one person has a soul bone, then all the calculations you mentioned earlier are unnecessary. Because the soul master who possesses the soul bone will have an absolute advantage."

  "Ah? The soul bone has such a great effect?" Tang San looked at the master with some surprise.

  The master nodded and said, "The soul ring's additional effect is the soul skill, although it also enhances the soul master's own attributes, its main function is still on the attached soul skill. On the other hand, the soul bone is just the opposite. Perhaps the soul bone does not come with skills, but its enhancement to the soul master itself is enormous. More importantly, the growth potential of the soul bone is more precious than that of the soul ring. The skills attached to the soul ring will increase in amplitude as the soul power increases, which you know. But you should also know that the lifespan of the soul ring itself will limit its amplification. Even a 90-level or higher title Douluo, his first soul ring skill will not be amplified to a sufficiently strong degree, and this is the reason why. The soul bone, on the other hand, is not limited by the lifespan of the soul beast that produced it, but only evolves with the increase in the soul master's own strength. In other words, the earlier you get the soul bone, the longer time you will have to evolve it."

  Tang San said: "There are so many bones in the human body. If one could absorb that many kinds of soul bones into oneself, wouldn't it be ever-changing and boundless..."

  The master shook his head and said, "Although there are many bones in the human body, they can be divided into only a few major parts. Therefore, generally speaking, the soul bones that can be absorbed are also limited to a few categories: limbs, head, and torso. In other words, ordinary people can absorb six pieces of soul bones at most. It's like how a Soul Master can absorb nine soul rings. The quality of the soul bone and its effect on the Soul Master mainly depend on whether it is absorbed early or late and whether its attribute matches one's own."

  Tang San suddenly said: "Then this piece of soul bone from the Man-Faced Demon Spider is undoubtedly compatible with my body, it's a Body-Refining type of soul bone, right?"

  "What you just said is absolutely right. The most suitable way to obtain a soul bone that matches one's own soul ring is for the soul bone and the soul ring on one's body to come from the same type of soul beast. But this piece of soul bone doesn't belong to the Body Type category, which is why I say it's an external soul bone."

  "What is an external soul bone?" Tang San asked curiously.