Memoirs of an Isekai in Naruto

Log 17: Intent and Fuinjutsu

Warning I advise learning at least one seal before reading this log as all of it is conjecture. Learning this information might make learning seals harder so it is best to produce a seal to realize you can.

Fuinjutsu is also known as sealing techniques. This skill set is hardly explained and I can't find any ninjas that are willing to tell me anything.

This is what I do know that the Uzumaki were masters of this study before their destruction. This skill requires a large chakra reserve and seals are usually made of symbols written on a physical medium like paper or the human body and can either trap matter in a pocket dimension of some sort or be used to affect the physical realm.

They do this with the use of chakra so it must mean that anything done with seals is possible with the correct application of chakra manipulation and molding. 

For example, exploding tags must be a seal where one inputs chakra into a formation to trap the chakra and when activated converts said chakra using nature release into fire.

For example, sealing tags must be a seal where one inputs chakra into a formation to trap the chakra that is used to activate space-time ninjutsu.

These talismans are a cheap means of storing one's chakra for later but the downside is that this chakra can only be used For what is written into the seal. So this means once this seal is activated that unless the formation is designed for that all of the chakra is used and the formation is destroyed.

I suspect that seals work off of intent. What I mean by this is that one wills chakra with their intent when they mold chakra by any means. Chakra is not just a matter but is made of the energy of the body and soul and contains the will of the creator.

One applies this will to shape it using hand signs when casting Jutsu but with this skill one channels their intent through the concept of language. 

Language and more specifically words are a collection of symbols given meaning via constant training and repetition just like hand signs. Fuinjutsu piggybacks this idea as when someone channels their chakra while writing a language using ink and paper as a medium to visualize the action the chakra will complete.

Language itself doesn't affect chakra but it's one intent they must imbue into chakra with language as a visualization technique any form of symbols may be used but the greater the complexity allows one to have an easier time slowly visualizing, imbuing intent, and chakra for large effect. This is why some seals look like writing and others can look like a diamond on one's forehead.

However, this also makes Fuinjutsu one of the hardest skills to master as if you don't believe what you write and draw and can't visualize the effect of your chakra you can't create a seal no matter how powerful you are.

This is why one must learn from a teacher or books as a person creating Fuinjutsu from scratch on their own will have little belief that what they create can work.

Training is ability belief training I advise learning how to cast genjutsu as this illusion skill is all about honing one's imagination and convincing others that your imagination is real all you will have to do is convince yourself that the words you draw can make your imagination real.

The easiest way to begin is simple and basic to imagine phenomena like making a wall, imagining a fire, or making something no longer there. All of these things can be done easily so it's easier to imagine your chakra doing this action if you mold it.

Warning do not read if you are closed-minded 

The final stage of this training follows the concept of "all paths lead to the same truth" If you are capable of a great imagination, a firm intent, and enough chakra you will not need symbols just as ninjutsu does not need hand signs. 

All chakra in the end is the same energy others just found different training methods to hone themselves and how to apply themself to chakra. Chakra isn't truly limited by nature's affinities. Everyone can use every Chakra nature however Just like learning skills traditional skills people

Knowing this information is also a shackle so be warned faith, belief, and common sense are training wheels why else would an energy capable of creating any force or material even creating life from nothing be limited to only being good at creating simple things like fire? The more you learn the less you realize you know and the less belief you might have just remember chakra has no upper limits only what you can imagine.

Footnote 

The great molasses Flood Jutsu is great for urban combat not sure about its effectiveness on the highly mobile ninjas.