Both time-traveled characters ended up as villainous henchmen.

Back in the lab, Izumi Nen opened the two ninjutsu scrolls that Danzo had given him.

"The result is pretty much as expected."

Izumi Nen counted the more than thirty ninjutsu scrolls of various sizes that had been summoned, and a look of "I knew it" appeared on his face.

The lightning and water ninjutsu that Root gave him were mostly commonplace techniques, their only advantage being their variety.

However, there is a lot of overlap between his ninjutsu and the ninjutsu Orochimaru provided him.

Another thing that surprised him a little was that some of these water-style ninjutsu were improved by the Second Hokage, Tobirama Senju.

Of course, these ninjutsu are mostly C-rank or B-rank, with no high-level water-style ninjutsu.

Since Root knew that he was Orochimaru's student, their purpose in sending him these low-level ninjutsu was quite obvious.

Rather than trying to win people over, it seemed more like Danzo was demonstrating the strength of Root to him.

As long as you follow Root, you'll have plenty of high-level ninjutsu, especially the Second Hokage's Water Release ninjutsu.

As a disciple of the Second Hokage, it's not surprising that Shimura Danzo possessed some of the high-level ninjutsu left behind by the Second Hokage.

After taking stock, Izumi Nen organized all the ninjutsu into categories.

Although they were all low-level ninjutsu, their variety actually gave him the opportunity to broaden his knowledge.

"Now comes the main event."

After setting aside the exquisite little junk Danzo had given him, Izumi Nen took out the scroll that Minato Namikaze had given him.

"As expected of the Fourth Hokage, his skill and demeanor are beyond the reach of ordinary people..."

Izumi Nen had many new ideas after reading only a few of Minato Namikaze's suggestions. Combined with the subsequent knowledge about sealing techniques, such as how to use sealing techniques to guide and change the direction and speed of chakra flow.

This systematic knowledge of sealing techniques is far more efficient than the rudimentary methods he previously deduced using basic sealing techniques and the One World Meridian System.

"Perhaps, constructing a new chakra meridian flow system is not impossible..."

Izumi thought of the Dark Blood Yin Release technique, which was now in a dead end for him.

Although rebuilding a chakra meridian system that does not intersect with the Yuan Shui Water Release is extremely difficult and involves a huge amount of work.

However, it is not impossible if the sealing technique is applied properly.

"But... there's not enough time."

Izumi Nen sighed silently. He calculated the time; it shouldn't be long before Orochimaru returned to Konoha after completing his mission.

There simply isn't enough time to rebuild the chakra meridian system.

"Therefore, we need to think of a new approach."

Izumi leaned back completely, completely resting against the back of the chair.

He slowly closed his eyes, a look of struggle appearing on his face.

After a long while, he opened his eyes again, let out a long breath, and muttered to himself:

"Since we've hit a dead end, let's just tear everything down and start over."

Starting anew, through the fusion of Yin Release and Water Release bloodline limits!

At this point, all the struggle and hesitation in Izumi Nen's eyes disappeared, leaving only an unwavering determination and confidence!

Without lingering, he quickly got up and changed into his training clothes before heading to the underground training room.

Upon entering the training room, Izumi Nen immediately sat down cross-legged, calmed his mind, and silently mobilized the various elemental chakra within his body.

The last bloodline fusion was based on Yin Release, with Water Release gradually added to it.

Therefore, the proportion of Yin Release in Dark Blood Yin Release is larger, and the conversion rate of blood after it is absorbed is greatly enhanced.

Correspondingly, the evil nature originating from the Demon Slayer anime was amplified.

Izumi Nen speculated that this might be one of the reasons why his Yin Release and Yang Release were causing a rejection reaction.

Now that he's restarting bloodline synthesis, he naturally has to change direction.

Based on Water Release, Yin Release is gradually added to it, and the inclusive nature of water is used to fully incorporate the characteristics of the original Yin Release, and even eliminate its defects.

This attempt was far more difficult than the last one, and some of the problems encountered were beyond Izumi Nen's imagination.

He hadn't expected that simply changing the primary and secondary distinctions would result in such a huge difference between the two integration processes.

Fortunately, he was not defeated by this. After repeated attempts, the synthesis of the new bloodline gradually got on track.

It wasn't until the afternoon of the second day, at the time agreed upon with Root, that Izumi Nen finally exited his cultivation state.

Although the synthesis of the new bloodline limit is not yet completely successful, it is largely complete, and he can already feel the changes in himself.

The most obvious change is that the rejection phenomenon between Yin and Yang escape techniques within the body is greatly reduced.

Moreover, he can freely control the growing blood vessels, and their number is gradually increasing.

He is now able to control the abnormality in his blood circulation system back to the state it was in before sharing power.

It can be said that the current results are sufficient to satisfy Orochimaru's inspection.

However, this arduous bloodline synthesis process, coupled with the gains along the way, has only increased his expectations for the complete success of bloodline synthesis.

He has already built the basic framework; all that remains is to refine and perfect the details.

This part is just a matter of gradual progress, and it's not nearly as difficult as the beginning.

With the threat of Orochimaru's investigation gone, Izumi Nen's mind was completely at ease.

Even after cultivating for almost a day and a night, he didn't feel as tired as he had last time.

It's hard to say whether it's due to the new bloodline or the change in his mindset.

After quickly tidying up and washing up, Izumi Nen went out to meet the Root ninja.

In the familiar, secluded, tree-lined path, the Root ninja swiftly appeared upon seeing Izumi Nen.

Without much preamble, he threw out a scroll.

"Lord Danzo has agreed to your conditions, but the Four Symbols Seal is too profound a sealing technique. Giving it to you in advance would be useless to you, and might even be harmful to your current state."

The scroll contains some sealing techniques personally selected for you by Lord Danzo. You can start with these low-level sealing techniques and gradually learn them.

When the time is right, high-level sealing techniques will naturally be plentiful.

After saying that, the Root ninja gave Izumi Nen a special way to contact Root.

"This is a specially trained parasite. When you need something, or when Lord Danzo asks you to do something, it will inform you through it."

The specific usage instructions are also included in the Sealing Technique Scroll.

After completing the task assigned by Danzo, the Root ninjas did not linger and disappeared into the tree-lined path in a flash.

During the process, Izumi Nen did not ask any questions, but silently accepted the scroll and the parasitic insect, which can be regarded as a preliminary agreement to cooperate with Danzo.

Izumi Nen didn't examine the contents of the scroll closely, but he figured they were roughly similar to the water-style and lightning-style ninjutsu that had been delivered yesterday—all pretty common stuff.

He didn't linger long, quickly returned to the laboratory, ate a quick meal, and then went back into the underground training room.

In the days that followed, Izumi Nen devoted almost all his energy to bloodline synthesis, doing nothing but training, eating, and sleeping, and even giving up normal social interactions.

Not only did he stand Obito up, but he also failed to meet the Third Hokage, Hiruzen Sarutobi, who wanted to visit him for a discussion.

Hiruzen Sarutobi didn't have much of an opinion on this; on the contrary, he became very interested in Izumi Nen's recent mysterious actions.

Nearly twenty days passed in this manner.

Izumi emerged from seclusion, and the new Yin Release Bloodline Limit - Dark Water - was successfully synthesized!