Simultaneous time travel: But our system is out of sync!

Lin Bei arrived at the deepest part of the spiritual space.

Apart from him, there is only a primordial furnace of yang energy here, seemingly standing here since time immemorial.

The Yang Qi Furnace at this time was quite different from the one Lin Bei had seen last time.

When Lin Bei first saw the Yang Qi Furnace, it was covered in scars and cracks, with many defects.

Although it can draw energy from the void outside the spiritual world to repair itself, it's like an old ox pulling a cart—better than nothing.

Fortunately, he obtained the myth fragments stolen by Xiao Rizi from Saitama's underground base, which transformed the myth fragments into Xing Tian inscriptions, thus patching up a damaged hole.

Furthermore, the absorption of Muzan's spirit enhanced his spiritual power, which improved the state of the Yang Qi Furnace.

This also increases the efficiency of the Yang Qi Furnace in refining Yang Qi.

However, he had too much time and too many things to do, so he hadn't had a chance to test how much the efficiency had actually improved.

But now, upon entering, one sees that the yang energy furnace has taken on a new look.

Streams of light, like galaxies, poured in from the void beyond the spiritual realm, connecting with the yang energy furnace.

The once-ravaged Yang Qi Furnace has seen some of the large cracks around the Xing Tian inscription disappear, and even the remaining tiny cracks are visibly repairing and healing themselves.

The self-repair progress of the Yang Qi Furnace has already shown visible changes.

To put it more simply...

If the self-repair progress of the Yang Qi Furnace was 100 days, then this progress bar had never moved, forever stuck at 0.

Although Lin Bei knew that the Yang Qi Furnace could be fully repaired once it reached 100.

But he didn't know when he would reach 100.

I don't even know if I can reach 100.

But now the progress has become 1.

Although it seems to be not much different from 0, it is still far from 100.

But this is a landmark achievement.

It broke through the barrier of starting from nothing, and although it still doesn't know when it will reach 100, it lets Lin Bei know that 100 is achievable.

All of this was thanks to his suddenly surging mental strength.

Although Lin Bei had previously confirmed that enhancing mental strength would accelerate the self-repair speed of the Yang Qi Furnace.

However, the growth of mental strength is different from that of the physical body; it requires a great deal of yang energy and physical strength.

At his current rate of yang energy entering the tent, he simply cannot withstand the (consumption required for repair).

Therefore, he did not deliberately pursue the self-repair speed of the Yang Qi Furnace.

I plan to consider this aspect again when I have sufficient Yang energy in the future.

Unexpectedly, his mental strength increased from twice to eight times in just one day.

It has achieved leapfrog growth.

The gains Lin Bei received from this breakthrough were a pleasant surprise.

That is, the Yang Qi Furnace can refine the Qi of heaven and earth into Yang Qi through his breathing.

In other words, from now on,

Besides eating, sleeping, and basking in the moonlight, he could even obtain yang energy through breathing.

According to his tests, under normal circumstances, he can refine a wisp of yang energy every half hour through breathing.

In a 24-hour day, one can obtain 48 streams of Yang energy through breathing.

For Lin Bei at this time, this was definitely a considerable amount of Yang energy income.

It should be noted that on a clear night, he could only collect 30 to 40 streams of yang energy by basking in the moonlight, and each ordinary meal would only provide him with about 20 streams of yang energy.

In other words, he used to be able to accumulate only about 80 units of Yang energy per day at most.

However, this number will vary depending on factors such as weather conditions, the phases of the moon, the quantity and nutritional value of food.

Now, even a simple breath can increase the amount of yang energy entering the tent by one-third, reaching 120 units.

Keep in mind that he only gained a little over two hundred units of yang energy after killing an eye-and-eared demon.

This kind of improvement is simply terrifying.

This change also made Lin Bei realize the importance of improving his mental strength.

The Yang Qi Furnace has only reached 1% of its repair progress, yet it has already produced such a powerful effect. He dares not imagine what kind of heaven-defying effects it will have as the repair progress increases.

Maybe he can gain near-invincible power just by basking in the sun, like Superman.

However, after thinking it over, Lin Bei still withdrew from the mental space.

His most important task now is to strengthen his physical body as quickly as possible.

It's hard to say whether he could become Superman, but he'd definitely become a headless knight.

Moreover, now that he can obtain yang energy through breathing, Lin Bei no longer needs to conserve it.

Therefore, he poured all sixty strands of yang energy that he had already transformed into into physical enhancement.

A moment later?

"call!"

Lin Bei let out a long breath.

He felt a surge of heat rising from his body, and the muscles beneath his skin trembled slightly at a frequency invisible to the naked eye.

In Lin Bei's perception, his muscle tissue had become more resilient, and the power he could unleash was even more terrifying.

He had previously estimated that his overall muscle strengthening progress was around 65%.

Having just channeled 60 streams of Yang energy, his muscle enhancement precision has directly reached 68%.

That is, the progress of the twenty streams of yang energy increasing by about one percent.

He needs to push the muscle strengthening process to 80%.

This way, his physical body can initially accommodate his mental power, which has surged to eight times its original size.

Based on this calculation, he needs to advance his muscle strengthening progress by at least 12%.

That is, at least 240 streams of Yang energy are needed.

This amount is no longer a large sum for him at this moment.

Under normal circumstances, it only takes two days to accumulate enough yang energy.

But Lin Bei felt that this was not enough.

He cannot be satisfied with merely having enough mental energy to accommodate it.

Because it enhances both mental strength and physical power.

Their purpose is to complete the breathing technique.

The current mental strength requirements are sufficient, or even exceeded.

After all, based on his previous estimation, only five times the mental strength was needed.

Now only the physical enhancement progress remains.

Lin Bei doesn't need 80%, he needs 100%.

Only by achieving 100% muscle enhancement can he support pushing Yan Yang Jie to 1/1000 of his normal strength.

Only when the Flaming Sun's Normal state reaches 10 per thousand can he transform the Flaming Sun energy that is usually hidden in his limbs and bones into his breathing technique.

To truly embark on the path of the strong.

To push the muscle strengthening process to 100%.

Lin Bei now needs more than just 240 streams of yang energy.

Instead, it's 640 shares.

That means he will need at least five to six days.

Moreover, this is on the premise that he does not consume any more yang energy during these five to six days.

Actually, five or six days is not a long time.

It could even be said that it only takes five or six days to create a unique breathing technique, which is almost a divine skill for people in the Demon Slayer world.