Northern Underworld, Otsutsuki Origin Star.
A black Yomotsu Hirasaka portal opened, and Brook stepped through it, entering the Otsutsuki clan's former territory directly from the Northern Underworld.
This planet had once been overflowing with chakra. Now, after being absorbed by the Ten-Tails, Groot, the chakra in the air had grown far thinner. In exchange, the tailed beast had become increasingly powerful.
Of course, the thinning chakra was not only Groot's doing. Kaguya, Reimu, and Hourai had also contributed plenty.
"My husband, you're back!"
"Father!" the two children cried at once.
Princess Kaguya sensed Brook's return the moment he appeared. But when she saw him this time, the divinity around him was even more obvious than before.
A pair of nine tomoe white Rinnegan.
A six tomoe white Rinnegan on his forehead.
The sight left her utterly shaken.
At that moment, Kaguya even felt that she was no longer worthy to serve a true god.
"Did you miss me?"
Brook had only spent two and a half months in the Bleach world this time. Compared to the two and a half years he had spent dealing with the Otsutsuki elders, it was far shorter.
Princess Kaguya pressed herself into Brook's arms, while Reimu and Hourai floated quietly in the air, sensible enough not to disturb their parents' reunion.
Brook stayed on the Otsutsuki Origin Star for a week, spending time with his family.
After that, he returned to the Naruto planet and reunited with his women there for another month and a half.
Then, without stopping for long, he returned to the Northern Underworld, passed through the Underworld Domain, and entered the Western Underworld.
Brook was worried that Jin might discover his ascension to godhood. If the Western Underworld God learned of it, he might go straight to the One Piece world and kidnap Brook's family.
Because of that, Brook had to take the entire One Piece planet away and move it into the safety of the Northern or Southern Underworld.
Or, if it came down to it, he would fight Jin and see exactly how powerful this god was.
According to the Soul King's memories, the Eastern Underworld God was the strongest. Jin came next. Hirasaka and the Soul King were at the bottom.
Now, Brook had inherited a portion of Hirasaka's power and most of the Soul King's power. With both powers combined, he should at least be able to hold his own.
Before starting a war, he had to secure his family first.
Only then could he fight without holding back.
This time, a being as powerful as Brook had entered Jin's territory. It was impossible to hide his arrival from the Western Underworld God.
The Western Underworld God immediately awakened from deep sleep and entered battle mode.
Jin was deeply shocked by Brook's immense power.
This heretical soul had really grown so fast.
That made Jin wary, but it also filled him with greed.
Brook ignored him and rushed back to the One Piece world at top speed. Then, right under Jin's furious gaze, he directly pulled the entire One Piece planet into his inner universe.
"You actually possess a microcosm, and you can even bring it through the Underworld!"
Jin shouted in shock, his eyes burning with endless greed.
If he had such an ability, he would have plundered everything long ago and become unimaginably powerful.
" Jin, back then, I did grow step by step with the help of your Underworld power. Give me a piece of your memories, and for the next thousand years, we can leave each other alone."
Brook looked at him calmly.
"Otherwise, prepare to be ambushed and harassed by me at any time."
His aura surged.
"After all, I am now the ruler of both the Northern and Southern Underworlds."
With the Pirate King planet secured, Brook had no more worries. He unleashed all his power and prepared to fight Jin.
"You actually devoured Hirasaka and the Soul King!"
Jin's divine eyes swept wildly over Brook, analyzing the source of his power.
"No. You also have my power, the power of the Eastern Underworld God, and another power. The power of the Otsutsuki?"
Jin had never expected this mutated soul to fuse five divine powers within himself.
This was the power of a mutated soul.
The discovery made Jin covet Brook even more.
This special soul was far too powerful.
He wanted it.
He had to obtain it.
Brook also saw the greed in Jin's eyes. His nine tomoe white Rinnegan spun wildly.
No matter what, they had to fight today.
Brook wanted to find out Jin's true strength and what trump cards he still had.
In any case, Brook could retreat to the Northern Underworld or the Southern Underworld whenever necessary.
Jin was also thinking quickly, trying to figure out how to take Brook down in one blow and prevent him from escaping.
He desperately wanted Brook's special soul.
The two auras began to collide.
Then Jin suddenly pulled out a golden rope and hurled it toward Brook.
Brook's pupils contracted.
A single use god level artifact.
He had seen this thing in the Soul King's memories, so he knew how to deal with it.
Without hesitation, he threw the rune shield in his hand to block it and left behind a powerful soul clone in the same place.
Then Brook withdrew from the Underworld Domain at once, fleeing back to the Northern Underworld without looking back.
He even abandoned the rune shield.
"My God Binding Rope!"
Feng Jin roared in fury.
His god level artifact, a single use divine treasure, had been broken by a damaged artifact and a clone.
He was so angry that the entire Western Underworld trembled.
Jin chased after Brook like a madman, but in the end, he only saw Brook's fading shadow in the Netherworld.
That made him even more furious and restless.
The Western Underworld shook, and the sky and earth changed color.
For the next thousand years, he might truly be harassed and ambushed by this powerful mutated soul without end.
His future days would become troublesome, and he would not have a single peaceful day.
But he also had a chance to hunt this mutated soul down.
He needed to prepare again.
He could not rush into battle like he had this time.
---------
After returning to the Northern Underworld, Brook still felt a cold sweat on his back.
Fortunately, he had obtained all of the Soul King's memories. Otherwise, Jin might truly have captured him in one move.
Even a single use divine artifact was not something an ordinary god level being could easily stop.
As expected, gods with deep foundations and vast experience could never be underestimated.
Although Brook now possessed the power to challenge Jin, he had not experienced many true divine battles, nor did he have any divine artifacts to rely on.
That put him at a clear disadvantage in a fight.
"Forget it. I should deal with my inner universe first."
Brook used Yamamoto Genryusai Shigekuni's Bankai power, combined with Otsutsuki Reishi's [Never Setting Sun], to create a small sun within his own cosmos.
After taking in the One Piece world, he also pulled in the Naruto planet and the Otsutsuki Origin Star, forming a three planet system.
The small sun hung at the center, while the three planets occupied three separate positions around it. Their locations remained mostly fixed, but each planet rotated on its own axis to maintain day and night.
Brook even used Earthburst Star to create two moons for each of the three planets, so their nights would not be too dark.
Within his own small universe, Brook was like a creator god, constantly refining and perfecting the world.
To secure the energy supply of the three planet system and maintain the operation of the small sun, Brook began plundering resources from the Northern and Southern Underworld universes on a massive scale.
He even planted several more rounds of Divine Trees, stripping resources from both universes without mercy.
As time passed, Brook's cosmos became more and more complete.
He also took a portion of the Southern Underworld's hell realm and pulled it into his microcosm, merging it with the Pure Land of the Naruto world to establish the reincarnation system of the three planet system.
Whether they were his women and descendants from the One Piece world or his women and descendants from the Naruto world, all of them became gods within the three planet system, jointly controlling the Six Paths of Reincarnation.
As long as Brook did not die, they would not die either.
Later, even the officials from the Shinigami world were gradually incorporated into Brook's cosmos.
The Northern and Southern Underworlds continuously harvested soul power from their two universes for Brook, constantly strengthening his personal microcosm.
Brook's women and children in the One Piece world could hardly believe that the Brook who had always stayed by their side had only been a clone created by the Dark Dark Fruit.
Before they even had time to process that fact, they had already become gods, transforming from rulers of the World Government into a divine race that controlled life and death across three planets.
The women from the two different worlds felt somewhat helpless at first, but they quickly accepted reality.
Aside from managing the affairs of the underworld inside the microcosm, they still preferred to live on their original planets.
However, Brook's women and descendants also frequently left the microcosm, entering the Northern and Southern Underworlds to harvest resources and help support the development of the cosmos.
Because they already knew one thing clearly.
In less than a thousand years, they would have to escape these two universes.
Otherwise, they would all face pursuit from higher gods.
Some of Brook's battle loving descendants even earned fierce reputations across both universes.
Brook also continued absorbing the soul power produced by the reincarnation cycles of the two universes, accumulating strength bit by bit, preparing to evolve his forehead eye into a nine tomoe white Rinnegan.
...
Five hundred years later.
After countless years of accumulation, Brook finally evolved the six tomoe white Rinnegan on his forehead into a nine tomoe white Rinnegan.
After spending another year or two adapting to this power, Brook immediately began challenging Jin, the God of the Western Underworld.
For more than five hundred years, Jin had waited for Brook to die. Instead, this mutated soul had now launched his attack.
The longer Jin waited, the more anxious he became.
Back then, Brook had disappeared for only a few years before returning with power comparable to his own.
This time, Brook had disappeared for five hundred years.
That made Jin feel terrified, so much so that even while setting up ambushes, he never truly felt safe.
Sure enough, when Brook appeared again, his strength had already slightly surpassed Jin's.
However, Jin still relied on his high grade divine weapon to hold his own against Brook, who had no divine artifact. He even injured Brook several times, forcing him to retreat to the Northern Underworld to recover.
But each time Brook returned after healing, he became stronger.
It was as if Jin had become nothing more than Brook's sparring partner.
This made Jin increasingly afraid.
He truly did not know whether he could hold out until the day the higher god descended hundreds of years later.
Eight hundred years later, Brook's strength had grown even further.
His three nine tomoe white Rinnegan could actually fuse and evolve, returning to their original black pupils.
However, when Jin saw the twelve elemental tomoe within Brook's black pupils, he knew he was likely finished.
Brook had mastered metal, wood, water, fire, earth, light, darkness, wind, thunder, ice, time, space, and many other divine laws, abilities, talents, and powers.
With the power of the five gods fused within him, Brook's current strength was enough to crush Jin.
This made Jin even more certain that all these years, Brook had truly been using him as a stepping stone, borrowing him to train and sharpen himself.
"Are you here to take my life this time?"
Jin, God of the Western Underworld, held a black Soul Destroying Spear and looked at Brook with a face full of resentment.
In the end, he would have to follow in the footsteps of Hirasaka and the Soul King.
He had never expected that three of the four Underworld Gods of the lower Sangri Domain would fall during this era.
He did not know whether the Eastern Underworld God could withstand this mutated soul's attacks during the remaining one or two hundred years.
"I need your power and the resources of the Western Underworld to continue growing stronger."
Brook's expression was calm.
He had to become stronger in order to face the pursuit of the higher gods.
He needed to gain enough power before the higher gods descended, so that he could ascend to the upper realm like Otsutsuki Shibai.
However, he would not ascend with only his soul.
He would ascend to the divine realm with his own universe, his family, and everything he had built, establishing himself there in one move.
Otsutsuki Shibai had ascended with the strength of a low level god, making him easy to bully in the divine realm.
If Brook could ascend in his true body with the strength of a high level god, or even a quasi supreme god, his starting point would be far better.
He could even use the advantage of his mutated transmigrator soul to move freely between intermediate and even advanced hell regions, plundering resources and continuing to grow stronger.
"Then come!"
With a roar, Jin raised the Soul Destroying Divine Spear and charged at Brook, his entire body wrapped in terrifying underworld energy and ghostly aura.
This time was different from before.
Brook had less than two hundred years left.
He no longer needed to use Jin as a whetstone.
Brook unleashed his full power, approaching the level of a quasi supreme god. With a single strike, he knocked the Soul Destroying Spear out of Jin's hand.
"Let's end this. I will make good use of your body and the Western Underworld Universe."
A powerful spatial force erupted from Brook's body, freezing the time and space around Jin.
In the next instant, a bloodstained hand pierced straight through Jin's heart.
…..
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