Published at 28th of May 2026 7:38 am

Chapter 948 Comprehensive Upgrade

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Perhaps something like the Four-Red-Yang Formation! There is no doubt about the Defensive Capabilities of the Four-Red-Yang Formation.

If a person attempts to break the Four-Red-Yang Formation using the brute-force approach, then they need to use energy attacks that surpass the level of Tailed-Beast Bomb used by the Ten-Tails, and even then, it wont be destroyed that easily.

In the canon, the first four Edo-Tensei Hokages worked together to trap the Ten-Tails inside the Four-Red-Yang Formation and even contained the explosion created by the Tailed-Beast Bomb used by the Ten-Tails without getting destroyed. Sure, its shape was altered as it let out all the steam and heat from the opening above; however, after the explosion, it returned to its original shape.

Therefore, unless it is something like a Time-Space Ninjutsu that can transcend the physical boundaries, an attack at the level of the Sage-Of-Six-Path, or maybe something on the level of Kekkei Tota like the All-Killing-Ash-Bones, the Four-Red-Yang Formation can sustain any physical attack without any problem.

It truly is one of the strongest defensive enchantments. Of course, Kuroto wont say that it is the strongest since there are enchantment barriers like the Six-Red-Yang Formation and others that one can only use when their strength touches the realm of the Sage-Of-Six-Path, but below that realm, it is undoubtedly one of the strongest barriers.

Of course, since the defensive Four-Red-Yang Formation is much stronger than something like the Four-Violet-Flame Formation, the conditions for using it are more stringent too.

The Four-Violet-Flame-Formation only requires four Chunin-Level Shinobi to use it; on the other hand, in order to use something like the Four-Red-Yang Formation, four Kage-Level shinobi are required to join forces. Of course, this requirement, in the case of the Four-Red-Yang Formation, is a bit of an exaggeration because Kuroto personally believes that even four Jonin-Level can work together to create the Four-Red-Yang Formation. The only difference between the formation that the four Jonin-Level shinobi and four Kage-Level shinobi created would be that the one created by the Four-Kages would be much stronger compared to the one created by Four-Jonins.

Another thing is that the requirement of four Kage-Level shinobi is actually not necessary because, in the canon, Obito clearly created the Six-Red-Yang Formation, a barrier that is far superior to the Four-Red-Yang Formation, all on his own. Therefore, the main requirement is Chakra and a method to transmit it at different points so that the barrier can be formed.

Kuroto can easily fulfill both requirements. Therefore, he believes that he will be able to create a Four-Red-Yang Formation all on his own. While it may not be as strong as the Four-Red-Yang Formation created by the four Edo-Hokages and may not be enough to contain or prevent something like the Tail-Beast Bomb used by the Ten-Tails, against attacks below that level, it should be fine.

Lets see this point then here this point here should be good And finally, this one, muttered Kuroto as he marked four different points that he was going to use for creating the Four-Red-Yang Formation around the Ancor Vantian.

In the canon, Obito used six Black Receivers to transmit his Chakra into them and created the Six-Red-Yang Formation. Kuroto needs to follow the same example. Both Kuroto and Karin can create the Black Receivers using the Yin-Yang Release, so there should be no problem.

With the plan ready, Kuroto started the comprehensive transformation of his flying fortress, Ancor Vantian. Of course, he cant do something like a comprehensive transformation of Ancor Vantian while it is floating in the sky, for that he needs to land the flying fortress on the land, which he did. The location he chose for this was the Forgotten Island (the island that appeared in episode 227 of Naruto Shippuden) near the Land of Lightning where many of his Summons live. He had even brought Yui to this island once for a hot spring trip.

This Forgotten Island has been lost on the seas and surrounded by storms; therefore, no human ever comes to this place. Except for many animals that inhabit this island, there is only the ghost Honoka that lives on this island. A perfect place for Kuroto to carry out a comprehensive transformation for Ancor Vantian.

After he landed the Flying Fortress on the Forgotten Island, the comprehensive transformation of Ancor Vantian began in full swing.

With the help of Ryumyakus Chakra, the Chakra of the Giant Tenseigan of the Hyuga Clan, Kuroto was able to put hundreds of puppets to work at the same time. Under the leadership of the Sandaime Kazekage Puppet Kasa, these puppets worked. Additionally, he used the Chakra of Moryo the Demon to create hundreds of Rock Golems for heavy manual labor.

While these puppets and Rock Golems do not have high combat effectiveness, they can be useful for manual labor. Of course, Gaara also assisted with his Sand and actively helped Kuroto wherever he could, while Karin helped him with designing and other things.

So, even if only Kuroto, Gaara, and Karin were the living people on the island, the atmosphere was quite lively, and the sound of hammering continued to echo on the island, scaring the inhabitants on the island.

Kuroto himself wasnt resting either. Despite having deployed hundreds of puppets and rock golems, he also created a dozen Shadow Clones and supervised everything personally. His main body continued to unseal the Storage Scrolls that stored all the raw materials required for the comprehensive transformation of the Flying Fortress.

All this raw material was purchased by Kuroto from different countries using different identities. Although the entire process was quite troublesome and tiresome, since he had no other option, he had to do it.

The main focus of the comprehensive transformation is to strengthen the structure and the core of the flying fortress as well as remove and renovate all the unnecessary facilities.

Since this Flying Fortress/Temple was created by the people of the Land of the Sky, they had designed it with the purpose that hundreds of their Shinobi could live there. Hence, this place has a lot of living quarters. As per Kurotos estimation, more than three hundred Shinobi can comfortably live here without any problem, and in case of emergencies, this place can even accommodate thousands of people.

Kuroto obviously doesnt require these living quarters for hundreds and thousands of people; these areas are useless for him. Therefore, he is going to remove all these areas and leave space only for a dozen people for normal times and at most 50 people in case of emergencies. For him, this much should be more than enough.

Additionally, since Ancor Vantian was created like an ancient temple, there are a lot of strange and weird structures and sculptures created by the people of the Land of Sky that are quite repulsive according to Kurotos taste. Sure, he doesnt dislike art and history, but who would want their base of operation to carry such an architectural style?

Kuroto had long since wanted to remove these weird structures and sculptures from Ancor Vantian, and this was the perfect opportunity. There are also several watchtowers on the air fortress. In his opinion, most of them are not needed. Two to three are fine, but dozens of them. Not needed at all! For conventional warfare, these facilities are good, but thats only for conventional warfare. For people of the level of Nagato, Toneri, Obito, Madara, Konan, and others, these are simply useless.

Not only are these structures useless, but they also affect the aesthetics of the flying fortress. Not to mention that they affect the overall structure by increasing the wind resistance, which makes maneuvering the flying frtress in the air quite difficult. Except for the Large Chakra Cannon that can be used to destroy an entire village, Kuroto doesnt plan to keep these facilities at all.

Once all these useless facilities and areas were removed, Kuroto focused on the core, i.e., the power source of Ancor Vantian.

As he had decided earlier, there will be two different energy sources to run the flying fortress. The main source is naturally Moryo, the demon, while the backup source will be the Giant Tenseigan of the Hyuga Clan.

This will ensure that even if there is some problem because of the lack of energy during the time when the Chakra Cannon is being used, the Giant Tenseigan of the Hyuga Clan will be able to resolve those problems.

Of course, in addition to the Four-Red-Yang-Formation, there will be a few different isolation barriers present in the power room, such that the presence of Chakra Sources like Moryo and the Giant Tenseigan of the Hyuga Clan cannot be perceived by anyone.

The main reason is that if the Giant Tenseigan of the Hyuga Clan is being used, there is a strong possibility of it resonating with the Giant Tenseigan of the Otsutsuki Clan, and if that were to happen, Toneri might learn of its location.

Kuroto cant allow something like that to happen; hence, he has to make sure that the Giant Tenseigan of the Hyuga Clan is isolated enough to not resonate with the Giant Tenseigan of the Otsutsuki Clan on the Moon.

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