The requirements of the first layer are very simple, after releasing a sword qi with a specific technique, it will not collapse for five breaths, and it can perform the simplest straight-line attack. This naturally did not have any difficulty for Li Fei, but Li Fei increased the difficulty on his own, not only greatly enhancing the power of the sword qi, but also increasing the time for the sword qi to last to the time of a stick of incense, and at the same time controlling the sword qi to attack from various angles.

Three days later, Li Fei had fully reached the goal he had set and began his second-level cultivation. The second layer is just one more sword qi, and so on, due to the previous cultivation of the Heavenly Dust Shield, on the basis of raising the requirements, Li Fei has proceeded relatively smoothly.

Three months later, Li Fei successfully reached the fifth layer of the "Nameless Sword Spectrum", and he could control the five sword qi to attack. Due to the consideration of the power of the sword qi, Li Fei lowered the time requirement for maintenance and kept it at the time of the small half incense, so as to ensure that each blow can reach about half of the attack power of the silver small sword, but the combined power can reach more than twice as much!

Starting from the sixth layer, there has been a qualitative change in the requirements, it is no longer a simple attack requirement, but a precise "fusion", simply put, it is only necessary to control two powerful sword qi, but it quickly fuses at the moment before attacking the enemy, so that it can release greater attack power. It's easy to say, but it's a lot of difficulty to operate, not only do you need to grasp the timing, but you also need to accurately control the distance and speed of the two sword qi, as long as you make a slight mistake, your efforts will be wasted.

It took another half a year for Li Fei to fully master the sixth layer, and he casually tested the power on a random stone, and the effect was okay, he could easily cut a big stone into several pieces, basically reaching about 1.5 times the attack power of the silver sword. Li Fei was not satisfied, because with this kind of power, there was no advantage at all, and it was only slightly stronger than the same level, which was of little significance.

Time flies, and in the blink of an eye, Li Fei and Yue'er have been in this underground cave for almost five years, and they only communicated with Yue'er a few times in the middle. Li Fei had finally cultivated the "Nameless Sword Spectrum" to the eighth layer, and he could control five strong sword qi to fuse attacks at the same time, but the power reached more than three times the attack power of the silver sword! Li Fei was confident that with an attack of this intensity, he should be able to fight with those "black-robed people" who were masters of the cottage knot, of course, it was not enough to defeat the other party based on this alone. Li Fei finally gave this sword qi fusion attack a domineering name: Life-seeking Sword Thunder.

In addition to cultivating the "Nameless Sword Spectrum", Li Fei naturally will not relax his own cultivation, the high-grade spirit pill has long been used up, and there are still many medium-grade spirit pills. After five years of hard work, Li Fei's cultivation has improved a lot.

According to Li Fei's original plan, he originally wanted to practice the ninth layer of the "Life-seeking Sword Thunder", but unfortunately, after half a year's efforts, there was no hope at all, mainly because the divine thoughts were not enough to control the seven strong sword qi. If you reduce the power of the sword qi, you can barely achieve it, but the power is even worse, so in the end, you can only give up temporarily.

Finally, it is worth mentioning that due to the cultivation of the "Life-seeking Sword Thunder", Li Fei's use of the Heavenly Dust Shield has also been slightly improved.

According to the old habit, after Li Fei finished his cultivation, he took a bath in the underground river, and in the process of bathing, he found that the water quality of the underground river was quite good, so he collected some of them. In the end, Li Fei went to see Yue'er and found that she was still cultivating, and she fell asleep after a full meal.

Two days later, Li Fei woke up, feeling in good condition, looking at the gravel that was broken by himself all over the ground, and had the urge to try the "Life-seeking Sword Thunder" again, looking at the last largest boulder leaning against the stone wall, the "Life-seeking Sword Thunder" was quickly launched, and the five bright sword qi rushed to the middle of the boulder at lightning speed, and at the moment of collision with the boulder, the five swords were one, bursting out with dazzling light, and after a loud bang, the boulder that exceeded several zhang was stopped and cut down!

Li Fei glanced at the results of the battle, was very satisfied, and was about to leave when he went to look for Yue'er, when he suddenly found that the middle of this boulder was hollow. Li Fei glanced at Yue'er, and saw that she hadn't come out anyway, out of boredom, he walked over and took a look, and soon showed a surprised expression!

When he came to the stone cave where Yue'er was cultivating, Li Fei found that Yue'er was angrily bombarding the stone wall, with no rules to speak of, and persuaded him: "Yue'er, don't worry, you haven't practiced well for a while, just practice slowly." ”

Yue'er stopped her attack and said angrily: "This damn eighth layer, I've been practicing for two years, and I still can't fully master it, so I get angry when I look at it." ”

Li Fei hugged Yue'er into his arms and comforted: "Don't be sad, didn't we discuss it last time, the main reason is that your divine thoughts are not strong enough, and the current practice is not in vain, I estimate that when you enter the late stage of foundation building, you will naturally be able to perform it." ”

Yue'er's anger subsided a little, and she said a little helplessly: "I also know the reason, I just want to practice the eighth layer as soon as possible, and it will not take decades to enter the Great Perfection in the late stage of foundation building, I'm afraid it won't work." By the way, Brother Fei, have you practiced the eighth layer?"

Li Fei knew that Yue'er was angry about the eighth layer of things, and replied vaguely: "It's similar to you, sometimes it succeeds, sometimes it doesn't, it depends on luck." ”

Yue'er suddenly gave Li Fei a pink punch, and scolded with a smile: "The annoying Brother Fei wants to lie to me again! I know that your divine thoughts are much stronger than mine, and you must have succeeded, hum......"

Li Fei hurriedly surrendered, and said with a straight face: "Since Yue'er thinks that I have succeeded, I must succeed......!"

After a while, Li Fei said mysteriously to Yue'er: "There is good news, there is a close-range teleportation array hidden in the pile of rocks on the opposite side, should we explore it?"

Yue'er said without hesitation: "Of course I'm going! If there is any danger, I just want to try the power of the eighth layer of the 'Nameless Sword Spectrum' that I have just not fully cultivated." ”

Li Fei echoed: "Yes! If Yue'er's attack accidentally fails, I will make up for it immediately! By the way, Yue'er, I have given this trick a name, called 'Life-seeking Sword Thunder', what do you think? In this way, we can be regarded as famous." ”

Yue'er's eyes lit up, and she agreed: "Okay! It's called 'Life-Seeking Sword Thunder'!"

Li Fei and Yue'er quickly came to the teleportation array, cleaned up the dust, and revealed the true face of the formation. This is a small teleportation array with a diameter of about half a zhang and precise positioning, which is already somewhat damaged, but fortunately, it is not a critical part. Li Fei and Yue'er painted the scoop according to the gourd, and according to the original traces, it took half an hour to repair.

After repairing, Yue'er suddenly remembered something and said, "Brother Fei, this is a precisely positioned teleportation array, which requires nine ordinary spirit stones and one high-grade spirit stone. Since it was useless for me to use the high-grade spirit stone before, I didn't have a high-grade spirit stone......"

Li Fei didn't speak, he directly took out nine ordinary spirit stones and put them into the formation slot, and then took out a high-grade spirit stone and put it on, and said seriously: "Yue'er, we are about to be teleported to an unknown place, don't underestimate it, I am responsible for activating the formation and resisting the pressure of space, and you are responsible for vigilance in case of accidents." ”

Yue'er nodded, took out a pair of turquoise rings, held them in her hands, and stood back to back with Li Fei in the center of the formation.

Li Fei pinched the magic trick in his hand, activated the formation, and then quickly released the Tianchen shield, wrapping the two of them tightly, and a burst of white light flashed and disappeared. After Li Fei and Yue'er teleported away, calm was restored in the stone cave. After another moment, there was a soft sound in the stone cave, and the formation exploded on its own, becoming irreparable fragments......

Not long after, Li Fei and Yue'er appeared in a fiery red. Li Fei instantly felt that there was an unbearable heat wave all around him, and he was still in the sky dust shield. Yue'er naturally felt it, and quickly released the child and mother ring, and the small ring tied the two together and flew to the side, and the big ring formed a thick green protective light curtain, which felt slightly better.

Li Fei only had time to look at the surrounding environment, but after only a glance, he shouted bad luck, and had a strong premonition that he was being calculated!

This space is not small, it is seventy or eighty zhang square, it is a confined space, with tumbling magma below, surrounded by a rock wall that has been roasted red, and there is almost no place to stay. If it weren't for the fact that this space wasn't big enough, Li Fei would even suspect that he had been teleported to the center of the earth!

At this time, Yue'er's face was discolored, but she was soon roasted again, and she was anxiously looking for a place to stay.

Li Fei forcibly calmed down and began to look for a suitable place to stay. Suddenly, Li Fei found that there was a place in the middle of the stone wall opposite, and there was a depression that might have been formed by the collapse of the rock, which was several zhang wide, enough for the two of them to settle down temporarily, and hurriedly said to Yue'er: "Fly over to the opposite side, there is a place where you can take shelter for a while." ”

Yue'er had no idea at this time, listened to Li Fei's words, and rushed over. After rushing through the center of the magma, Yue'er was in a hurry for a while, lowered the altitude, and a sudden upward thrust of magma crashed into the green protective light curtain, and the light curtain instantly dimmed, and Yue'er exclaimed in fright. Fortunately, with this momentum, Li Fei and Yue'er finally fell into the depression before the green protective light curtain completely collapsed!

When Li Fei approached the depression, his hands were wildly raised, and a large amount of heat-resistant and heat-insulating debris was sprinkled into the depression, forming a loose accumulation. The bottom layer is made of bricks and tiles, and in the middle are a dozen bags of cement, on which are two large water tanks, and on which are thick solid wood boards.

Just after hurriedly preparing these temporary heat insulation measures, Li Fei and Yue'er landed on the top solid wood plank, and the two of them breathed a sigh of relief for the time being. At this time, Li Fei was very glad that he didn't throw away these seemingly useless things, and another very important reason was that the blue bracers were big enough.

After being down-to-earth, in order to be able to hold on a little longer, Li Fei took out another water tank and filled the cement bags that had been stacked in advance with water, so as not to scatter the bags immediately after they were burned. In addition, considering that although this space is relatively large, the air is extremely poor, Li Fei took out a small oxygen cylinder, released most of the oxygen, and kept a small amount of oxygen in case of emergency.

After Yue'er saw that Li Fei was busy, she asked a little desperately: "Brother Fei, what should we do next?" With the ultra-high temperature here, we can't last long, and because the temperature around us is too high, we can't escape." My mother-and-child ring has partially failed just now, and it can't provide protection, will we be roasted to death here?"