For the next period, Rosen temporarily stayed at the Senju Clan.
Senju Tobirama couldn't understand the content of the "Twenty-Four Qi Refining Sutra" at all, so Rosen could only teach Senju Tobirama hand-in-hand.
At the same time, Senju Tobirama also taught Rosen Ninjutsu from the sealing scroll.
Besides discussing and researching with each other every day, the two also sparred.
Senju Tobirama and Rosen fought seriously a few times, and the win rate was basically 80-20.
His strength was clearly stronger than Rosen's, but he didn't have an absolute win rate.
The main reason was Rosen's bizarre Shadow Secret Technique.
For short-range movement, the Shadow Secret Technique was more effective than the Flying Thunder God Technique.
Currently, the Ninjutsu Rosen learned from the sealing scroll included Multiple Shadow Clone Technique, Flying Thunder God Technique, and Four Symbols Sealing.
The Four Symbols Sealing here was not the same as Danzo's Reverse Four Symbols Sealing later on.
The Four Symbols Sealing was a powerful Seal, but it was not considered dangerous and could reach S-Rank Seal level.
An S-Rank Seal was already a Sealing Jutsu that could be used for a few of the smaller Tailed Beasts.
However, the Reverse Four Symbols Sealing, like the Corpse Reanimation Seal, was a suicide Seal.
At the same time, Rosen also asked Senju Tobirama for Mystical Palm Technique, Yin Healing Wound Destruction, and Chakra Scalpel.
Rosen did not have the self-healing ability without hand Seals like Senju Hashirama.
Senju Hashirama's Sage Body was extremely abnormal; even the two protagonists did not have such an abnormal constitution as Senju Hashirama.
Although he coveted Senju Hashirama's constitution, it was not something he could obtain just by coveting it.
So, he could only turn to healing Ninjutsu. Yin Healing Wound Destruction was the most suitable A-Rank Ninjutsu for self-healing, while Mystical Palm Technique was used to heal others and could also heal himself, but its effect was weaker compared to Yin Healing Wound Destruction.
Yin Healing Wound Destruction significantly boosted Rosen's Combat strength, from 1550 to 1700.
As for Chakra Scalpel, it was purely for close-quarters combat.
After learning Chakra Scalpel, Rosen's Combat strength increased from 1700 to 2000, which shows how much Chakra Scalpel improved his combat power.
Chakra Scalpel emphasized precise operation, low consumption, and high lethality, making it an absolute killing divine skill.
Senju Tobirama had also initially mastered the "Twenty-Four Qi Refining Incantation," and he had already entered the Dao. He Cultivated the Great Cold Energy.
Senju Tobirama's Water Release combined with the Great Cold Energy, the effect was simply too wonderful.
Senju Tobirama discovered that the "Twenty-Four Qi Refining Sutra" Rosen taught him was completely different from his elder brother's Sage Art.
His elder brother's Sage Art was a short-term burst, capable of directly increasing Ninjutsu power tenfold.
However, the improvement from Rosen's "Twenty-Four Qi Refining Sutra" was not as great, but it was an all-round improvement.
Both constitution and Ninjutsu had clear improvements, at least a twofold increase.
And it could also turn his Water Release into Ice Release.
This effect was not a Bloodline Limit, but it surpassed a Bloodline Limit.
Moreover, this effect could be sustained for a long time.
Although Senju Hashirama had a natural Sage Body, his Sage Art Chakra was also limited and could not be endlessly empowered by Sage Art Chakra.
And the Great Cold Energy he had now Cultivated, although not large in quantity, could be maintained throughout if controlled properly.
Senju Tobirama didn't have the abnormal output ability of his elder brother, and most battles required a very long time.
Therefore, short-term bursts were far less valuable than long-term enhancements.
A month later, Rosen found Senju Tobirama.
"White Hair, I plan to leave."
Senju Tobirama was a bit disappointed: "Do you have to go?"
"I am not from the Nara Clan."
"I already knew that." Senju Tobirama had long sent people to the Nara Clan to verify, and there was no such clan member named Rosen wandering outside.
He completely understood Rosen hiding his identity, and Rosen's secret technique was very similar to the Nara Clan's Shadow Secret Technique, so it was reasonable to disguise himself as a Nara Clan member.
Of course, the most important thing was that he confirmed Rosen had no ill intentions towards the Senju Clan.
"I still want to travel around, but I will come back."
"Where are you going? How long will it take?"
"Probably six or seven years. I hope the Ninja World will be peaceful by then."
Rosen had a clear purpose. Staying here to help the Senju Clan fight was not only dangerous but also offered no benefits.
Uchiha Madara was too fierce after obtaining the Eternal Mangekyo, and his personal safety could not be guaranteed at all.
Any major move could take his life.
Moreover, he needed to enhance his strength and gain spacetime points.
"Where do you plan to go?"
"Uncertain."
In fact, Rosen already had clear goals and directions.
Senju Tobirama did not press further but said seriously: "Next time you return, you will see peace."
"Then you'll have to work hard."
"This is something Big Brother asked me to give you." Senju Tobirama threw a scroll to Rosen.
Rosen looked at the scroll, the Uzumaki Clan's classic Sealing Jutsu, Adamantine Sealing Chains.
Rosen embarked on his journey again, heading west.
The further west he went, the fewer wars there were, and similarly, the sparser the population became, especially after leaving the Five Great Nations' territory, where he could barely see a single person.
However, Rosen still encountered a caravan of a dozen people along the way.
Rosen happened to want to inquire about the situation in the west, so he proactively struck up a conversation with the caravan leader.
The caravan leader was a middle-aged man with a distinctive red nose, looking somewhat smooth: "Young man, where are you going?"
"I am a wanderer, collecting various legends and materials, and I don't have a fixed destination. Your caravan must have many stories, right?"
"Is that so? If you buy some goods from our caravan, then I can tell you an ancient story about this land."
"I hope the things your caravan sells are practical; I'm not rich."
This caravan sold handicrafts, food, and some herbs, with a rich variety of goods.
After picking out a few useful items, Rosen sat down by the campfire.
He handed the newly bought wheat wine to the caravan leader.
The leader took a sip of wine. Just then, Rosen heard a squeaking sound, followed by a ferret climbing from the leader's pocket onto his shoulder.
"Hey, hey, Nilugu, you can't drink this." The leader pressed the ferret back into his chest pocket.
"Is this little fellow your pet?"
"It's not a little fellow; you should call it an old fellow. It's older than my Grandpa."
"Are you kidding? How can this kind of ferret have such a long lifespan?"
"Heh heh..."
The leader began to talk about the various experiences of their caravan.
Not every story was legendary, but coming from his mouth, they were mesmerizing.
After the leader finished a few stories, he said: "Further west, there are no people."
"Is it the end of the World?"
"Beyond that is the Great Sea."
"How can that be? I once heard that there was a glorious civilization in the west."
"There once was a great nation, but it angered the gods, and eventually, the entire kingdom sank into the Great Sea."
"What truly malevolent gods," Rosen said meaningfully.
The next day, both parties went their separate ways, but Rosen did not truly leave.
Instead, he monitored the caravan from a thousand meters away.
Rosen's goal was the ferret named Nilugu.
Seventy years later, this ferret named Nilugu was still alive.
The reason it was still alive was that it regularly ate greer stone.
It was also one of the only two 'people' who could find the ruins of ancient civilization.
The other was the red-nosed leader.
However, he was the Guardian of the ruins. Even if Rosen caught him, he wouldn't tell him where the ruins were.
But Nilugu needed to eat greer stone every once in a while.
This greer stone possessed powerful and mysterious energy.
The glory of the ancient civilization was entirely built upon greer stone.
This energy could grant people longevity, but it could also turn people into stone or beasts, very similar to the Sage Art Chakra of the Three Great Sage Lands. Only the royalty of the ancient kingdom could avoid negative effects.
On the fifth day of monitoring the caravan, Rosen finally saw Nilugu leave the caravan and dash into the mountain forest.
It seemed very familiar with the area and quickly disappeared into the mountain forest.
After running for more than ten kilometers, it arrived at an ancient building built against a rock wall and slipped through a crack in the building.
Rosen did not enter the ruins but sent a Shadow Demon through the crack.
After about ten minutes, the Shadow Demon returned to Rosen with a few luminous blue stones.
"Is this greer stone?" Rosen took a stone. As soon as he held it, he felt the Qi contained within it, but this Qi was not pure.
There were also many Impurities, so it was no wonder that others would experience various mutations and beast transformations after absorbing it.
However, Rosen was not worried. He would not absorb it himself but let the Four Shadow Demons absorb it.
After the Shadow Demon's process, pure Qi was sent into Rosen's body, and the Impurities were left for the Four Shadow Demons.
And the Shadow Demons would not be poisoned; they wouldn't even get injured, so they directly used physical means to expel the Impurities remaining in their bodies.
After absorbing one greer stone, Rosen felt a surge of energy. "Good stuff!"
This one greer stone was equivalent to a year of his Cultivation.
Then he planned to start absorbing the second greer stone.
However, Rosen found that his body was like it was full, and the absorption efficiency was very low.
This situation continued until the third day before it recovered, and he could again normally absorb the Qi within the greer stone.
After absorbing the fourth greer stone, Rosen found that he had already entered the second layer of the awakening of the spirit.
This was also the accumulation of Rosen's hard Cultivation in the past few years, and of course, with the help of the Shadow Demons, the actual accumulated Cultivation time was at least twenty years.
The the awakening of the spirit formed a metal-like substance in the Qi Sea, but once activated, they would immediately re-gasify. This was the second layer, Qi-Forged Huangting.
This Huangting was not some building, but a qualitative change of Qi, stored in the Qi Sea in different forms.
Rosen found that his Combat strength had increased from 2000 to 2400.
He tried some Ninjutsu, and the power of the Ninjutsu had increased by at least one time.
His constitution should also have improved, but there was no reference, so it was difficult to make an accurate assessment.