Fujin sat in his basement, carefully reading the information in the scrolls. It wasn't the first time he had read it. In fact, it was the first seal he studied after getting promoted to the Anbu Captain rank. But the last time he read, he realized that he wasn't ready to learn the seal.

After reading all the information once again, Fujin summarized, 'Four Symbols Seal A seal made of just four symbols. Sounds so simple... Unfortunately, that isn't the case. The truth is that this seal contains thousands of symbols arranged in a very complicated manner. In terms of complexity, this is the most complex seal I have seen.

The thousands of symbols are arranged in such a way that they take the shape of four symbols, giving the seal its name. The four symbols themselves have a particular function.

The first symbol is to make the seal adaptable. It allows certain changes to be made to the seal such that every Four Symbols Seal is different from each other, sort of like a signature or a fingerprint. And once the seal is created, this symbol allows the seal to be further modified.

Due to this, the ones who know this seal and are aware of the details in this symbol can make it stronger or weaker if the host doesn't resist or considers them a threat. In addition, the seal can also be influenced by other seals to make the sealing much stronger.

The second symbol is to suppress what is sealed inside this seal. It restricts the amount of power the Tailed Beast controls. In fact, it can pretty much shut down all power of a tailed beast and forcefully put it to sleep.

The third symbol is to make the seal resilient. If the Tailed Beast somehow overcomes the suppression of the second symbol, then the resilience granted by this symbol is enough to temporarily stop a Tailed Beast from breaking out and provide the host with an opportunity to resist and fight back.

It would also provide defenses to prevent someone from forcefully changing the seal. Though if the difference in power between the two ninjas is high, it won't be much help.

The last symbol's effect is a bit vague and variable. It uses the willpower and determination of the host to increase or decrease the effects and strengths of the other three symbols. Though it isn't a fixed boost, it is a good addition. After all, the willpower of any person will be the highest when death is right in front of them.

So at the moment when the Tailed Beast is about to break out forcefully, this symbol would provide a huge help to the host. In addition, if the host faces an external threat, such as a situation where his friends are being killed while he helplessly watched, the determination to live or resist the Tailed Beast can decrease, lowering the power of the seal and allowing the Tailed Beast to break out and rampage against a superior enemy force.'

Fujin stayed in silence for a few minutes to digest all the information. After around seven minutes, he analyzed, 'If the purpose is to only seal a Tailed Beast or something similar, then this seal is good enough. But there are some major flaws.

The first major flaw is that it doesn't steal chakra from what is sealed inside. So if a Tailed Beast is sealed inside a ninja, then that Jinchuriki can only act as a nuke. He won't be able to access any chakra of the Tailed Beast unless the Tailed Beast breaks the seal and kills him before rampaging on the battlefield.

And the other major flaw is that, unlike Naruto's seal, this seal doesn't allow anyone else to enter the seal and help them fight the tailed beast.

So these effects should be from the Eight Trigram Divination Seal, which is created by overlapping two Four Symbol Seals. Unfortunately, the Library doesn't have the Eight Trigram Divination Seal. And asking Hiruzen for it will raise a lot of questions, starting from how I even know about that seal or what I plan to do with it.

Fortunately, I do have some ideas. The Four Symbols Seals have to be overlapped in such a way that they don't completely overlap with each other. I can try learning using the Trial and Error method. If I can't, then I can only think of a way to ask for it from Hiruzen without arousing suspicions.

After all, for me to implement any of those plans I created, the Eight Trigram Divination Seal is more important than even the Flying Thunder God!'

There was a reason why Fujin wanted to master this seal. It was due to an idea he had long ago when he was in the academy. Over the years, he introspected the idea several times. Though he became more and more aware of how difficult it would be to make that idea a reality, he never found anything that would completely rule out the feasibility of his idea. Finally, he was about to take a major step towards it.

Without wasting any time, Fujin created 80 Shadow Clones and began learning the seal. The complexity of the seal meant that even with numerous clones, Fujin would still need a long time to learn and master the Four Symbols Seal!

For 13 days straight, Fujin kept working on the seal until he was called for another mission. After dressing up in his Anbu attire, Fujin flickered towards the Anbu Headquarters.

He appeared inside Eagle's office and asked, "Another escort mission?"

Eagle shook his head and said, "No."

He placed a map on the desk between them, pointed at a location and said, "The Ito family in the Land of Waterfalls has recently been experiencing strange incidents. There have been a lot of murders happening in the villages in their territory. In some cases, the entire population inside the villages have disappeared. And there have been no signs of struggle.

Tanigakure sent some of their ninjas to investigate but came empty-handed. I sent another Anbu squad to investigate but they didn't find anything either. They stayed in their territory for one month during which no incident occurred. However, a few days after they returned, the incidents began happening again.

For some reason, whoever is doing this, is only targeting the civilians. And they have managed to hide from any ninjas investigating. The previous squad I sent specialized in tracking and investigation but was unsuccessful as well. So I'm guessing that a SealMaster or GrandMaster might be involved."

Fujin listened carefully. Eagle added, "Your mission is to inspect who is causing this. If you find the culprit, you can decide whether to kill or capture them or even let them go if you have a good reason. If you don't find anyone, then make a decision on when to stop and return back to the village."

Fujin nodded and replied, "Alright. We will move out soon."

He took the map that had all the markings of where the incidents had happened. He went into his team's assigned room and analyzed the information while his clones moved to call his teammates.

Fujin analyzed, 'This case is weird. The targets are all over the Ito family's territory and no one area has a higher number of attacks. Still, attacking civilians and possible Fuinjutsu mastery Is it the Jashin?

They were active in the Land of Grass last time. And this area isn't too far off from them. But the Land of Earth is also close to this place. So there could be a possible Iwagakure involvement. I need to be careful in case the Jinchurikis or Onoki are involved.'

In around half an hour, his team assembled, ready to move. Fujin explained the mission parameters and left the village. Though Fujin's squad didn't have anyone who specialized in tracking or picking up small clues like scent or hidden footprints, every one of them was a sensor. Though Yugao and Bunjiro's sensor skills were very good, they were still quite handy. Both had improved considerably during the last 7 months.

Within a day and a half, Fujin's team reached the town in the Land of Waterfall where the Ito family lived.