After transplanting the Rinnegan, digesting Nagato's memories, and possessing Chakra, Yami quickly mastered the Yin-Yang Release black receivers and the basic abilities of the Rinnegan.
Unfortunately, the Rinnegan was different from the Mangekyo Sharingan. If one was not the original owner, they could not use the Rinnegan's exclusive Dojutsu, no matter how strong Yami was.
However, Yami was not disappointed. He transplanted the Rinnegan solely to gain control over the Gedo Statue and to capture and seal the Tailed Beasts.
After mastering the basic abilities of the Rinnegan, Yami began absorbing Kirigakure's ninjutsu and knowledge.
With the awakened Memo-Memo Fruit and Brain-Brain Fruit, Yami could read ten lines at a glance and never forget anything.
Any knowledge or images he saw would turn into books or film rolls, permanently stored in his brain's library, available for viewing at any time.
Therefore, Yami quickly digested Kirigakure's decades of accumulated foundation and mastered all of Kirigakure's Water Release and secret techniques.
Having transplanted the Rinnegan, Yami possessed all Chakra natures: Yin, Yang, Wind, Fire, Water, Earth, and Lightning. He could learn any ninjutsu or secret technique.
If he mastered the nature transformation of all seven attributes, with the Munch-Munch Fruit, Yami might even be able to eat himself and synthesize two or more Chakra nature transformations into new Kekkei Genkai or Kekkei Tota.
However, Yami didn't waste time doing these things.
Apart from being interested in Dust Release, he didn't even care about the Wood Release Kekkei Genkai.
No matter how strong a Kekkei Genkai was, it couldn't reach the ultimate level of physical destruction.
Yami's combination of the Tremor-Tremor Fruit and Press-Press Fruit represented the pinnacle of physical destruction.
If further multiplied by the More-More Fruit, it would be physical destruction on the level of a Truth-Seeking Ball from another dimension.
Whether it was Wood Release or the Complete Body Susanoo, in front of Yami's three-ability combination technique, they were as fragile as thin paper, unable to withstand a single blow.
Only Kekkei Mora and Shinjutsu could attract Yami.
After digesting Kirigakure's knowledge, Yami summoned Mei Terumi and drew a tube of her blood.
Looking at Yami, who had changed into a white uniform, with hair like a waterfall and a gentle and refined demeanor, Mei Terumi, who was originally full of apprehension, suddenly mustered the courage to ask, "Lord, are you a scientist?"
"Half of one. Right now, I should be considered a qualified scientist," Yami said with a kind smile.
Seeing Yami's temperament change from his previous domineering aura to something very gentle, Mei Terumi heaved a heavy sigh of relief. A charming smile appeared on her face as she continued to ask, "Lord, are you people from the outer seas?"
The technology in the Naruto World was very bizarre. They had televisions, computers, and scientists, but nobles still traveled in horse-drawn carriages, and sea travel was still done by sailing ships.
In her eyes, the world consisted of the Ninja Continent and some islands.
The vast sea without islands or continents was called the outer seas.
Before this, Mei Terumi also thought there shouldn't be land or people in the outer seas.
But now, looking at these people who were ridiculously tall—some women were several meters high, giants not recorded in any history books of the Ninja Continent—Mei Terumi, who couldn't conceive of other worlds, could only guess that Yami and his group were experts from a different race in the outer seas.
"You could say that. To you, I am indeed an outsider."
Yami, who held Mei Terumi's life in his hands, didn't hide it and nodded, smiling, "Don't worry. As long as you obediently listen, I won't harm or enslave you."
"As long as you gain Hancock's approval, you can even learn their Haki."
Hearing this, Mei Terumi's beautiful eyes instantly lit up. "Haki, is that the large-scale mental shock?"
"Yes, that is Conqueror's Haki, which only one in a million possess. It's a power that only special individuals have hope of awakening."
Yami nodded and said, "Besides Conqueror's Haki, there are Armament Haki and Observation Haki. If you have any questions, go ask Hancock. They are all nice people and won't reject you."
"I understand. Then I'll take my leave first."
Understanding that Yami was busy with something, Mei Terumi nodded very obediently and prepared to muster the courage to chat with Hancock and the other women.
With the arrogant Hancock, Mei Terumi would definitely face a cold shoulder.
However, Carina and Robin, who had extremely high emotional intelligence and were good at socializing, would definitely take the initiative to be friendly with Mei Terumi.
As long as Mei Terumi completely became one of them, Kirigakure would truly become a subsidiary force of the Black Hole Pirates, willingly serving the Master and maintaining his rule over this ninja village and country.
Yami didn't have time to cultivate such pawns himself. As the Master's maids, they needed to take the initiative to share the Master's burden.
While Mei Terumi took the initiative to befriend Hancock and the other women, Yami also began manufacturing the genetic serum.
On the way to and from Amegakure, Yami had personally tested it. Coming from another world, he couldn't extract Chakra at all.
He had to modify his body structure and have Chakra shared with him to extract it.
Possessing the Op-Op Fruit and Munch-Munch Fruit, Yami could easily modify himself, but he couldn't use such abilities to modify Carina and the group.
Therefore, Yami planned to use Mei Terumi's blood to create a genetic serum similar to Green Blood. This would distribute the Chakra in the blood to Carina and the group, giving them the aptitude to extract Chakra.
Having digested Nagato's memories and Kirigakure's decades of accumulated knowledge, Yami felt this method was very feasible.
Thus, Yami took out the scientific equipment stored in his Spatial Backpack and began developing the genetic serum.
Possessing the Memo-Memo Fruit and Brain-Brain Fruit, and having awakened both abilities, Yami's creativity might not match Vegapunk who loved research, but his execution ability was not inferior to Vegapunk at all, perhaps even superior.
Although Vegapunk hadn't developed the Seraphim yet, the cloning technology and Green Blood technology were already perfected.
Through the knowledge left by Vegapunk and the Ancient Kingdom, Yami only failed a few times before successfully creating the genetic serum.
However, he didn't let Carina and the women drink it immediately. He first tested it on a Kuja warrior.
When she drank the genetic serum and successfully merged her spiritual energy and physical energy to form Chakra, Yami then mass-produced the genetic serum and had Carina, the women, and all members of the Kuja Pirates drink it.
Soon, Carina and all the women mastered Chakra, and their strength was enhanced once again.
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