After swallowing the "Blood Source Pill" and sitting cross-legged on the bed, Shi Ling closed his eyes and began to cultivate according to the mental method of the fourth layer of "refining tendons" he had obtained.

The third layer of "washing tendons" is to clean all the tendons and veins in the body and discharge the impurities and filth in them, and "refining tendons", hence the name, is to cultivate these tendons and veins in the body.

"Refining tendons and cultivating the mind" is to absorb the mysterious energy between the heavens and the earth and the universe outside the body by visualizing the "ghost skeleton", visualizing that these energies are absorbed into the body by the "ghost skeleton", and then flow out from the "ghost skeleton", so that the power of the "ghost skeleton" pours into its tendons and veins, refining into blood tendons, and each blood tendon is refined, the power in its body will be enhanced by one point, and finally all the muscles and veins in the body will be refined into infinitely powerful blood tendons.

When all the blood tendons in the body are refined, its human body can be said to have undergone earth-shaking changes, and its body has basically transformed and evolved into a humanoid weapon, with unimaginable terrifying power, and it is not false to say that one person can match the combat power of an army.

Refining blood tendons has such terrifying power, and the process of cultivating them is naturally extremely difficult and slow, just this fourth layer of "refining tendons", if there is no external force to assist, it will only be possible for the fast to be ten years, and the slow one for twenty or even thirty years.

Of course, if there is external help, the situation is completely different, such as this "Blood Source Pill" in "Rare Treasure".

The mysterious force represented behind this "Tower of Guidance" has vast magical powers, and through its superb means, it can replicate and grow this "blood energy" in an infinite amount, and then create the "Blood Source Pill".

Swallowing the "Blood Source Pill", the power of the ghost skeleton will be combined with the blood energy that is extracted from the "blood tendon", and then the tendon will be refined, which is almost equivalent to reloading the blood energy that is originally refined in the "blood tendon" into the cleaned tendon veins, and its speed will naturally increase greatly.

If you don't use external forces to "refine your muscles", it is equivalent to slowly condensing the water vapor in the air to form water droplets, and then collect it into a bottle.

However, although the process is extremely simple, if you want to refine the muscles and veins of the whole body into "blood", the amount of blood energy required is also extremely considerable, and the amount of blood energy contained in each "Blood Source Pill" is not much.

And the blood energy in the "Blood Source Pill" is finally an external blood energy, in the process of "refining muscles", you must also combine the power of your own "ghost skeleton" to refine the "blood energy" in it, and then refine it to kiss and match your own muscles and veins, so that the body can adapt, if you can't adapt or be in a hurry, but there is a danger of life, in short, even if you have the "Blood Source Pill", its cultivation process is still full of danger and difficulty.

Shi Ling has the fourth-layer "refining tendons" mental method, and after understanding all of these clearly, he swallowed a "Blood Source Pill" and really started "refining tendons".

When refining tendons, you need to gather your mind, and then visualize the "ghost skeleton" in your mind, visualize the "ghost skeleton" in your mind and constantly begin to absorb the mysterious energy in nature from all directions, and then turn this mysterious energy into that cool energy, which slowly flows into your body, and finally selects one of the tendons and injects it into it.

The "Blood Source Pill" began to exert its wonderful use, and it was constantly absorbed and fused by the "power of the ghost skeleton", and gradually formed a new blood energy, which began to be injected into the "tendon veins" selected by Shi Ling.

The first step of "refining tendons" is the tendons and veins on both arms, Shi Ling took into account that the right arm has been fused with the "Spirit of Iron Armor", and this time the first tendon veins selected by "refining tendons" are located in the left arm.

Constantly visualize the "ghost skull" absorbing the mysterious energy of the universe of heaven and earth, and then produce a large number of "ghost skull power", "ghost skull power" combined with the blood energy in the "blood source pill", together with the blood energy selected by Shi Ling, continue to pour into it, gradually, the mist of blood-red energy continues to inject, when it reaches a certain saturation, it finally condenses to form a drop of blood energy that really belongs to Shi Ling, blood can drip into this vein, crisp and pleasant, like a jade bead falling on the plate.

The effect of the "Blood Source Pill" has disappeared, and the blood energy in it 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 very small blood-red dot seemed to emerge from the skin, and with his thoughts, this blood-red dot that was much smaller than a grain of rice could roll freely.

Shi Ling looked at the rolling blood-red dots, the direction of his left arm, which represented a vein, he exhaled lightly in his mouth, he understood that the fourth layer of the "refining tendons" realm, he was just getting started, and then looking at the "guide", it was less than ten minutes before the second round of "spider attack", obviously he had just practiced, and it took him forty or fifty minutes.

"Let's see, if you have enough 'Blood Source Pill', it is not too difficult to cultivate the Blood Tendon, it's just ...... A 'Blood Pill' costs four rewards, and copying it also requires twenty Mana Points...... Cultivating the Blood Tendon requires a reward...... If you want to increase the power of ghosts, you also need rewards, and to survive in this world, you need rewards for everything, and the rewards are ......."

Thinking of the upcoming second round of "Spider Attack", the first round of victory has a basic reward, and killing a "Blue Spider" can get an additional reward, according to his estimate, the second round of "Spider Attack" appeared in the blue spider, there is definitely more than one.

There are already more than forty black spiders that appeared in the first round, and there must be more in this second round, which is definitely a good opportunity to earn magic energy points. After thinking clearly, he pushed the door out, sat down on the spot, and then used the "magic bag" to make ten small grenades in one go, took them all out, and put them beside him, and then made a few more submachine gun magazines, took out the submachine gun and put it aside, and the "saber" was also pulled out by him and inserted by his side, and then looked at the "guide", it was only a few minutes before the second round of "spider attack".