Chapter 642

If it is a bit too large, it is equivalent to using a Lei Dun ninjutsu on oneself, which will naturally injure the body; if it is too small, it will fail to achieve the effect of body tempering.

Among the information about Lei Dun secret techniques extracted from the Third Raikage, the part that was missing was precisely how to control the 'amount,' so Lu Chen could only try this part himself.

Of course.

Because he possessed the ability of Time Reversal, he could use the most brutal method to test it, without needing to carefully deduce it bit by bit.

The Second Raikage, who created this ninjutsu back then, increased the amount of lightning-attribute chakra bit by bit, finally reaching the most appropriate level, and organized a complete set of cultivation methods, which took a very long time; Lu Chen, however, could greatly shorten this time.

Half a day passed in a flash.

At the bottom of the canyon.

Lu Chen looked at the lightning light entwined on his arm, staring intently until the entwined lightning dimmed and disappeared, revealing an arm with no abnormalities.

"It works."

Lu Chen clenched his fist and felt that his arm had no damage at all, only a slight tingling sensation, and its toughness seemed to have subtly improved.

Crackle, pop!!

After determining the degree of chakra to produce, Lu Chen sat cross-legged there. The chakra in his body surged suddenly, turning into lightning-attribute chakra, which crackled and rippled, covering his body surface in an instant.

Unlike the Eight Gates Lei Dun state, the thin layer of lightning light covering the body surface was more similar to the forms of the Third Raikage and Fourth Raikage, but it looked much weaker.

Zzz!!

Lightning-attribute chakra continuously intertwined inside and outside Lu Chen's body.

These lightning-attribute powers, under Lu Chen's indulgence and lack of control, began to naturally erode every cell of his body, but the degree was just right and would not cause destruction.

Under this erosion and stimulation, Lu Chen felt his whole body heating up, and every cell seemed to be undergoing the tempering of lightning-attribute chakra.

"It seems there is no problem; it should be like this... Next is to gradually adapt, gradually increase the magnitude of chakra, until the body becomes more and more adapted to the flow of Lei Dun chakra..."

After sensing for a moment, Lu Chen realized there were no issues. He closed his eyes slightly and began to practice in the state of five-fold speed.

It is worth mentioning.

Just a few days ago, the ability of time acceleration had been upgraded again, the upper limit changing from four-fold speed to five-fold speed, increasing the range of time flow change once more.

It's just that the ability corresponding to 'Scale III' was still shrouded in mist; the mist had only thinned a little, and it seemed that if no special changes occurred, it would be difficult to unlock in the short term.

Zzz!!

If one were standing not far away and looking at Lu Chen at this moment, one would see that Lu Chen was in a strange state, as if the position his entire body occupied had become a fast-forward scene at several times the speed.

The wisps of white lightning arcs that constantly popped out from the surface of his body were at a normal speed, but the rate at which these lightning arcs were produced was not normal; they were being born at an extremely fast speed.

The body-tempering lightning-attribute chakra itself, after turning into lightning arcs, was already a form of externalized ninjutsu and was no longer controlled by Lu Chen's time flow rate, but in the state of time acceleration, he would produce more lightning-attribute chakra at a higher frequency.

And because the body was in a state of time acceleration, he could still normally withstand the impact brought by these denser lightning arcs, and his cultivation speed was still improved, but this improvement did not simply correspond to the multiplier of time acceleration; it was more complex and could not be accurately calculated.

Three days later.

Lu Chen completed the most preliminary tempering.

He spent some time deducing the next stage of lightning-attribute intensity, and then continued with new tempering and cultivation.

As time passed, he continuously increased the intensity of the lightning attribute, and his body also became more and more compatible with the power of the lightning attribute under the tempering.

During this cultivation process, Lu Chen also confirmed one point: this 'lightning-transformation modification' of the body was indeed helpful for the further opening of his Eight Gates Lei Dun!

After training for half a month, he had already clearly perceived that when using the Eight Gates Lei Dun, the damage caused by the lightning attribute to his body had become much lower; if he only opened to the Fourth Gate, he didn't even need to use Time Reversal to recover, as he could resist that part of the side effects.

"In this way, there is indeed hope to open to the Eighth Gate."

Lu Chen murmured in his heart.

Previously, it was almost impossible for him to open to the Eighth Gate, because the Eight Inner Gates is a ninjutsu that is easy at first and difficult later; from the Third Gate onwards, it becomes harder the further one goes. For him to open to the Sixth Gate, his physical age would probably have to grow to about twenty years old, and to open to the Seventh Gate, it would probably require being over thirty.

Although he could use time acceleration to speed up this process, the actual growth of his physical age would not change, unless he used Time Reversal to reverse it, but that would render all previous cultivation results void.

When a ninja reaches over thirty years old, all that can be further improved is mental power and combat experience; the body will almost never show improvement again.

Forty years old is the peak that can be maintained, and after that, it will gradually begin to decline. ===== CHAPTER 644 =====