Transformation! Son Goku's Super Saiyan 4!

"Soya, I have already passed the first stage. Can the second stage begin now?"

Son Goku spoke with a sense of impatience.

"In such a rush? Very well, let us begin the second stage now."

Soya smiled, his expression casual as he spoke.

He personally didn't mind, but since Son Goku had asked, they might as well start.

"What is the second stage?!"

BOOM!

The answer to Son Goku was the power that erupted violently from Soya's body.

The strength Soya possessed now far exceeded what it had been before.

"Such immense power! It's much stronger than when he fought Lord Beerus!"

Son Goku's gaze sharpened as he watched Soya.

"Son Goku, my base power has reached 100 trillion after my battle with Beerus!"

After unleashing his full power, Soya looked at Son Goku and spoke slowly.

"According to your terminology, that is equivalent to 100,000,000,000,000 in power—a level you cannot currently imagine. I do not expect you to defeat me without transforming into a Super Saiyan. As long as you can hold out for one hour against one-tenth of my base power without transforming into a Super Saiyan, you will have passed the second stage."

Soya spoke slowly.

"Of course, during this process, you may use any method you wish, excluding the Super Saiyan transformation. Whether it is Kaioken or the Spirit Bomb, you may attempt any method you can think of."

Soya laid out the challenge for the second stage.

"One-tenth, you say? If it's only for an hour, I should be able to manage that."

Son Goku looked at Soya.

WHOOSH!

Son Goku shot forward, rushing toward Soya at incredible speed.

His speed was so great that even Soya's gaze sharpened in surprise.

"I didn't expect this guy's strength to have improved so much; he really has caught me off guard."

Soya remarked in astonishment.

BANG!

BANG, BANG!!

BANG, BANG, BANG!!!

Son Goku launched a continuous barrage of attacks, each one executed with extreme speed. Furthermore, it wasn't just his speed; the power behind his strikes remained consistently high.

If that were all there was to it, it wouldn't be a big deal.

However, what truly caught Soya's attention was that Son Goku's attacks were actually growing stronger by the moment.

"As expected of the warrior race, the Saiyans. This fits him perfectly."

Soya was very satisfied with Son Goku's performance.

Nevertheless, despite this, his own strength far surpassed Son Goku's.

Under these circumstances, no matter how hard Son Goku tried, it was to no avail.

His attacks had absolutely no effect on Soya.

Even if he landed a full-force blow, Soya would not be injured.

But the reverse was not true.

A casual strike from Soya was a massive challenge for Son Goku.

Even the slightest contact would leave Son Goku with severe injuries.

Soya finally experienced the thrill he had felt when he fought Beerus back then.

Only this time, he stood in Beerus's position, while Son Goku was the weaker party.

In this manner, three days passed in the blink of an eye.

Throughout these three days, the battle between Son Goku and Soya continued without pause.

Yet, the result was the same every single time: it always ended with Son Goku being heavily injured by Soya.

This didn't happen just once a day, but once every hour—meaning that in a single day, Son Goku was severely injured at least twenty times.

Moreover, after each severe injury, Soya would not allow Son Goku to consume a Senzu Bean, forcing him to recover on his own.

It is no exaggeration to say that for Son Goku, these three days were like a nightmare.

Daily battles with Soya left even a battle-junkie like Son Goku feeling miserable.

Every time he had to recover from his injuries, it was a torment he could barely endure.

However, Son Goku was not without progress.

At the very least, the duration he could hold out had increased.

From only being able to last a few seconds at the start, he could now hold on for several minutes; this was growth.

Although he was still a long way from Soya's one-hour requirement, one must not forget that only three days had passed.

While Son Goku was undergoing hellish training in the valley, Vegeta, currently in the God of Destruction Realm, was clearly having a rough time as well.

Even though Whis's training methods were different, they remained a challenge for Vegeta.

Time slipped by unnoticed, and in the blink of an eye, a year had passed.

Throughout this year, both Son Goku and Vegeta had achieved tremendous improvements.

As for Soya, during the year he spent helping Son Goku train, he had successfully learned the King Kai's ultimate technique: the Kaioken.

Furthermore, under his own refinements, his version of the Kaioken would not be like Son Goku's.

Compared to Son Goku, Soya's Kaioken had no side effects and placed no burden on his body.

In other words, Soya could gain a boost in strength through the Kaioken without worrying about his body being unable to withstand it.

As for his own strength, it had been thoroughly mastered and integrated over the course of this year.

It could be said that the current Soya was in his strongest state yet.

"Son Goku, after a year of training, you now possess the strength to transform into a Super Saiyan 4."

"However, while transforming into a Super Saiyan 4 is no longer an issue for you, you are still within the realm of mortals."

"You need Godly Ki; only then will you be able to sense the presence of gods and survive in the vacuum of space."

Soya looked at Son Goku.

"Transform into it for me now and let me see!"

Seeing the tail that had reappeared behind Son Goku, a flash of light crossed Soya's eyes as he spoke.

"No problem!"

Son Goku nodded.

After a year of cultivation, his base combat power had reached 80 billion!

And after transforming into a Super Saiyan, he would be even more powerful.

BOOM

An incomparably powerful force erupted from Son Goku's body.

His combat power of 80 billion surged wildly at this moment.

Ten times, twenty times, thirty times, fifty times, one hundred times, three hundred times.

Son Goku's power skyrocketed crazily, as if it had no limit.

"Not bad."

Soya nodded, quite satisfied with Son Goku's improvement.

BOOM

A large amount of fur began to sprout on Son Goku's body, and his hair shifted from gold to black; in that instant, he transformed directly into a Super Saiyan 4.

An immensely powerful force burst forth from Son Goku, containing unimaginable, terrifying strength.

"Super Saiyan 4!"