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  Swallowed the "Blood Source Pill", sat cross-legged on the bed, Shiling closed his eyes and began to cultivate according to the fourth layer of "Refining Tendons" heart method he had obtained.

  The third layer "wash the tendon", is to clean all the tendons and meridians of the body, and remove the impurities and filth from them. The name "refine the tendon" implies the idea of cultivating and refining these tendons in the body.

  "The method of refining tendons and cultivating the mind" is to imagine "ghost skulls", absorb the mysterious energy between the heaven, earth and universe outside the body, imagine these energies being absorbed into the body by the "ghost skulls", and then flow out from the "ghost skulls", causing the power of the "ghost skulls" to surge into their tendons, refining them into blood tendons. Each time a blood tendon is refined, the strength inside the body will increase, ultimately refining all the tendons in the body into boundless powerful blood tendons. When this is achieved, the blood tendons will be like armor on the body, unbreakable when defending, and unstoppable when attacking, like thunderbolts.

  When all the blood vessels in the body are refined, the human body can be said to have undergone a tremendous change, and its body has basically evolved into a humanoid weapon, possessing unimaginable terrifying power. To say that one person's combat power is equivalent to that of an entire army is by no means an exaggeration.

  The power of the Bloodline is so terrifying that its cultivation process is naturally extremely difficult and slow. Just this fourth layer "Refining Tendons" alone, without external assistance, even the fastest would take ten years, while the slower ones would take twenty or even thirty years to complete.

  Of course, if there is external force assistance, the situation will be completely different, such as the "Blood Source Pill" in "Qí Zhēn".

  This "Blood Source Pill" is essentially a distillation of the mysterious blood energy within one's bloodline. The mystical force behind the "Guiding Tower" has vast and profound powers, allowing it to infinitely replicate and grow this "blood energy", thereby manufacturing the "Blood Source Pill".

  After ingesting the "Blood Source Pill", the power of the ghost skull will be combined with it, which is actually the blood energy extracted from the "bloodline". Then, refine the tendons, and this essence is almost equivalent to re-installing the blood energy that was originally extracted from the "bloodline" into the cleaned tendons. The speed has naturally increased greatly.

  If it is said that without the help of external forces, one's own "tempering" is like slowly condensing water vapor in the air into droplets and collecting them in a bottle. If you want to collect a bottle of water, the speed will naturally be slow. Now with the "Blood Source Pill", it's like directly carrying a bucket of water and pouring it into the bottle, filling up a bottle of water, which is extremely simple.

  Although the process is extremely simple, the amount of blood energy required to refine all the meridians in the body into "blood meridians" is also considerable. Each grain of "Blood Source Pill" contains a limited amount of blood energy, and to refine the meridians, a staggering number of Blood Source Pills are needed, which would require an astonishing reward to exchange for.

  Moreover, the "blood energy" in the "Blood Source Pill" is ultimately external blood energy. In the process of "tempering tendons", it is still necessary to combine one's own "ghost skull" power to refine the "blood energy" within, and then refine it to match one's own tendons and veins, making the body adapt. If it cannot adapt or is rushed, it will instead pose a life-threatening danger. In short, even if one possesses the "Blood Source Pill", the cultivation process remains fraught with peril and difficulty.

  Shi Ling possessed the fourth level of "Refining Tendons" mental technique, and only after understanding all these clearly did he swallow a "Blood Origin Pill", truly beginning his "Refining Tendons".

  When refining the tendons, one must gather their spirit and then visualize the "ghost skull" in their mind. Visualize the "ghost skull" continuously absorbing mysterious energy from all directions of nature, then transform this mysterious energy into a cool energy that slowly flows into one's body. Finally, select one of the tendon vessels and inject it into it.

  "Blood Origin Pill" began to take effect, being continuously absorbed and merged by the "Ghost Skull's Power", gradually forming a new blood energy that started flowing into the "meridians" chosen by Shi Ling.

  "The first step of 'Refining Tendons' is to refine the tendons and meridians on both arms. Shi Ling considered that his right arm had already merged with the 'Iron Armor Spirit', so this time he chose the left arm's internal tendons as the first tendon to refine."

  Constantly imagining "Ghost Skull" absorbing the mysterious energy of the universe, thereby producing a large amount of "Ghost Skull Power", which combines with the blood energy in "Blood Source Dan" and surges into one of the meridians chosen by Shi Ling. Gradually, the misty, crimson energy is constantly injected, and when it reaches a certain level of saturation, it finally condenses to form a drop of true blood energy belonging to Shi Ling. The blood energy drips into this meridian, clear and pleasant, like jade beads falling onto a plate.

  The efficacy of the "Blood Origin Pill" has dissipated, and the blood energy inside has been absorbed by Shi Ling's body. He opened his eyes, looked at his left arm, lifted his sleeve, and on his left arm, a tiny red dot appeared as if it had emerged from under his skin. With his thoughts, this small red dot, smaller than a grain of rice, could move freely.

  Shi Ling gazed at the rolling red dots, their trajectory on his left arm representing a meridian. He let out a gentle breath, understanding that he had just entered the fourth layer of "Tempering Tendons". Looking at the "Guide Device", there were less than ten minutes until the second round of "Spider Assault". Clearly, his previous cultivation session had taken him forty to fifty minutes.

  "Think about it, if there's enough 'Blood Source Pill', cultivating the Bloodline isn't that difficult, it's just... one 'Blood Source Pill' requires four rewards, and duplicating it also needs twenty magic points... Cultivating the Bloodline requires rewards... Wanting to increase the Ghost Spirit's power also needs rewards, in this world, surviving is all about needing rewards, rewards..."

  Thinking of the upcoming second round of "Spider Invasion", the first round winner has a basic reward, and killing a "Blue Stripe Spider" can get an extra reward. According to his estimation, there will be absolutely more than one Blue Stripe Spider in the second round of "Spider Invasion".

  The first wave of black spiders had already exceeded forty, and this second wave would definitely be more. This was absolutely an opportunity to earn magic points. After thinking clearly, he pushed the door open and sat down on the spot, then used the "magic bag" to produce ten small hand grenades in one breath, took them out and placed them beside him, and then produced several more rifle clips, took out the rifle and put it aside, and the "military knife" was also drawn out and inserted beside him. Looking at the "guide", there were only a few minutes left before the second wave of "spider attack".

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