With Shukaku setting the precedent, the Four-Tails and Six-Tails no longer resisted having their chakra absorbed as strongly. After acquiring two new Chakra Fruits, one from the Four-Tails and one from the Six-Tails, Rasa chose to merge only the Six-Tails' Chakra Fruit into the Divine Tree of the Dragon Oasis.
This act triggered another explosive growth of the oasis, expanding its diameter from five kilometers to fifteen kilometers, and it kept growing rapidly. At this rate, within a year, the people of Sunagakure would inevitably discover the existence of the Dragon Oasis.
The reason Rasa did not merge the Four-Tails' Chakra Fruit was multi-layered.
First, extracting so much chakra from the Ten-Tails all at once risked provoking a powerful backlash. Although signs of such a reaction may have already appeared, Rasa still chose to act cautiously.
Second, the Four-Tails' Jinchūriki would eventually return to Iwagakure, and Rasa wanted to avoid allowing the Four-Tails to enter a chakra mode that could enhance Iwagakure's strength. Lastly, Rasa planned to merge the Four-Tails' Chakra Fruit into the Divine Tree of his own Yomi World. Thanks to the barrier separating the two worlds — a realm even the Sage of Six Paths could not detect — Rasa had already collected the chakra of the One-Tail, Three-Tails, and Five-Tails in his Shukaku Space. Adding the Four-Tails brought the total to four Tailed Beasts.
As for why he didn't merge the Six-Tails' chakra into Yomi World, Rasa considered the Six-Tails relatively easy to obtain. In the future timeline, the Six-Tails' Jinchūriki lived in a semi-wild, unaffiliated state. Capturing him wouldn't be too difficult, much like the Seven-Tails in Takigakure, who was in a similar situation. That left only the Two-Tails, Eight-Tails, and Nine-Tails remaining.
With that plan in place, even if the Sage of Six Paths took action against him now, Rasa could travel directly to the future timeline and capture the remaining Tailed Beasts. Once all nine were gathered, he would finally possess the power needed to freely reshape the world.
As Rasa merged the Four-Tails' Chakra Fruit into the Divine Tree within Yomi World, the world underwent another transformation. Originally, after fusing with the Three-Tails' chakra, Yomi World had formed a vast lake. Now, as the scale expanded rapidly, it began turning into a colossal sphere of water, an entire planet made of liquid.
At the core of this water planet, boiling magma flowed, and with the fusion of water and fire, a layer of rocky crust started to form, wrapping itself around the magma.
The once-motionless lake, now transformed into a rotating sphere of water powered by the circulating magma beneath, began to slowly spin like a true planet. This rotation brought changes to the other elements within the world.
The flowing lake started generating tides, while the atmosphere developed hot and cold wind currents. Clouds appeared in the sky, delivering rain and snow. The emergence of a hydrological cycle caused dust and floating stones suspended in the air to fall, gathering on the water planet's surface, where the first formations of land began to take shape.
"Interesting..."
Watching all this unfold, Rasa grew increasingly convinced that once he fully merged the power of all nine Tailed Beasts into this world, it might not only become a real, fully-formed world but could even give birth to life itself.
As for Rasa himself, after absorbing the chakra of the Four-Tails, Five-Tails, and Six-Tails, his personal power had risen to an entirely new level.
Beyond the explosive surge in his Senjutsu energy and the dramatic enhancement of his physical body, he had now mastered, in addition to his existing Senjutsu Limit techniques, Senjutsu Limit: Magnet Release, Senjutsu Limit: Wood Release, Senjutsu Limit: Sand Manipulation, Senjutsu Limit: Wind Release, and Senjutsu Limit: Water Release, three new ones: Senjutsu Limit: Lava Release, Senjutsu Limit: Boil Release, and Senjutsu Limit: Acid Release.
In addition, he had regained mastery over Earth Release and Fire Release. In other words, Rasa now controlled all five basic nature transformations except Lightning Release and possessed six Senjutsu Limit techniques.
Strictly speaking, Rasa should already be considered invincible in the current shinobi world. But as his power grew, he slowly realized it still wasn't enough.
Even though he had mastered so many forms of strength, all of that power remained on the same level. In chakra terms, this level could be called Kekkei Genkai. In Senjutsu energy terms, it was what he now referred to as Senjutsu Limit. But one should not forget that above Kekkei Genkai, there were even stronger forms: Kekkei Tōta and Kekkei Mōra. So wouldn't it make sense that beyond Senjutsu Limit, one could also develop Senjutsu Tōta and Senjutsu Mōra?
It seemed Princess of the That clan had been right; he truly needed to slow down and deeply understand the power he had already acquired. Only by developing the corresponding Senjutsu Tōta and Senjutsu Mōra could he truly gain the strength to contend with the Sage of Six Paths and even the Ōtsutsuki clan.
But before reaching that point, since he already possessed so much power, it remained necessary to use another special method to enhance his combat ability, even without having attained those upper tiers.
And what was this method?
It was none other than something Rasa had once given up on: the Rasengan.
However, Rasa harbored far greater ambitions. He aimed to develop a new technique based on the Rasengan, merging it with the foundation of his Senjutsu Limit: Divine Power Incarnate, to create a new form of Tailed Beast Bomb.
He called this new creation the Senjutsu Orb. Just as Rasa was deep in the desert working on the Senjutsu Orb, two pieces of news arrived that forced him to interrupt his training and return to the village.
Land of Wind, Sunagakure.
As time passed, the grand reconstruction and development efforts in Sunagakure continued steadily. Across the land of the new village, where a Tailed Beast Bomb had blasted the earth open, signs of construction were everywhere.
The excavation of the Flowing Sand River was also progressing smoothly, stretching over a hundred kilometers, completely freeing Sunagakure from the shadow of the Tailed Beast incident and rapidly pushing the village onto a path of growth. Every villager in Sunagakure now wore a hopeful smile about the future.
Kazekage's Office.
Inside the guest room, the Ino-Shika-Chō trio, who had arrived from the Land of Fire, had already been resting for over an hour, but their expressions still reflected deep shock. As the leader of the trio and recently reinstated as a senior advisor to the Hokage, Nara Shikaku spoke with a grave tone.
"You've seen it for yourselves, haven't you?"
"Yeah," Yamanaka Inoichi nodded.
"Just judging by the current size of Sunagakure's construction zone, the village has already grown to three or four times the size of Konoha. At this rate, Sunagakure overtaking us is only a matter of time. And with that Kazekage in power... it may not take long at all. It's giving me a headache..."
Chōza Akimichi patted his friend on the back and smiled optimistically.
"Don't put so much pressure on yourself. Minato's doing well too, isn't he?"
The three exchanged glances and laughed. Indeed, at the very least, Minato had achieved something significant as the new Hokage. For the first time in a long while, he had united all of Konoha. Even the Uchiha clan had expressed their support for Minato taking office.
Just then, the door to the guest room opened and Baki walked in.
"Come with me. The Kazekage is waiting for you."