Chakra enhancement is a way of concentrating and releasing a burst of chakra in physical attacks to significantly amplify their destructive power.
It is also known as Chakra Coating and Chakra Infusion because the Chakra is temporarily concentrated around a single point.
Though this is mostly used for Taijutsu, it can also be used for weapon's basic enhancement, to make its cut sharper and impact stronger.
However, basic Chakra enhancement on weapons isn't as effective as infusing elemental chakra into weapons.
If Kaiji were to compare it with Earth Armor Jutsu, it's a weaker version of it.
While Chakra enhancement comes from basic chakra and is mostly used for offensive purposes, Earth Armor Jutsu includes Earth Nature into the Chakra, making it more potent for defensive purposes.
It can also be used for strikes if Chakra is focused on the fists, making them tougher.
Once this concept was clear, Kaiji started practicing for Earth Needle Jutsu.
He dedicated the next few hours to learning this Jutsu, until the sun set and evening descended on Sunagakure.
While practicing, Kaiji initially felt that this Jutsu wasn't better with Earth Nature, because Earth Nature might make needles denser rather than sharper.
But he was proven wrong when he performed this Jutsu personally.
A small area of soft earth from the ground rapidly compressed.
It compressed and protruded upwards, forming a sharp, conical spike about 4-6 inches long and roughly only 2 inches in diameter.
Five needles, their color remaining that of the earth on the ground, but their shape appeared more pointed than just denser, which Kaiji had assumed at first.
He used them on the wall ahead, and they made small pricks and cracks on the wall.
"Well it is usefull for a E-rank Jutsu atleast!" He remarks.
...
Later he went to Tsumuji Snacks Shop, had a light dinner, and returned to his room in the Genin Corps department.
Before sleeping, he took out the scroll of ''Basic Fuinjutsu Primer'' and started reading.
Kaiji read that for Fuinjutsu, just like all Jutsu, precise Chakra Control is most important.
There were even a few practices given for that, though they mostly focused on teaching how to direct a precise amount of chakra to the user's fingers.
For that, he had to practice drawing lines and shapes with chakra without a physical medium, as taught in the scroll.
Kaiji initially thought the Fuinjutsu scroll might be very complicated, like coding computer programs.
But the scroll contained simple diagrams of fundamental symbols.
Kaiji meticulously studied each line and stroke, understanding what core concepts like 'contain', 'release', 'bind' and 'transmit' looked like in seal form.
Below them, the scroll outlined techniques that the user could practice drawing these fundamental symbols perfectly.
But for those, he needed ink and paper.
Since this practice started with ink on parchment, then attempts to 'draw' them purely with chakra in the air.
This is how the scroll taught basic fundamental lessons of Fuinjutsu.
"I will purchase them tomorrow," Kaiji said, before meditating a little and drifting to sleep.
...
Next day, in the early morning, Kaiji stood on the training ground, preparing to practice using Seven Heavens Breathing Activations in practical for the first time.
He had already gotten a small use of it, by linking his chakra with a particular breathing style to gain a sudden burst of speed and strength in Taijutsu.
But that was momentarily used, not for a long enough time.
Though Kaiji had practiced that with Taijutsu Strikes of Sunagakure for quite some time.
Sunagakure also had a few offensive Taijutsu strikes of their own, which included Sand Eruption Kick where ground sand particles merged around the leg, making it a whirlwind type, during the strike.
Then there were Sandblast Palm that hardened the muscles of the arm during the attacks.
Though they weren't strong like Daytime Tiger and Front Lotus and others techniques of Might Guy.
But with Chakra enhancement, these Sunagakure's Taijutsu strikes could do a lot of physical damage to an opponent.
And Kaiji had used them in practice for months now.
That's the main reason why his Taijutsu had improved.
Though he wanted to test how much he had improved, but he didn't get any chance yet.
While to understand Chakra Enhancement Taijutsu better, take the example of Rock Lee, whose unweighted punches are just pure Taijutsu.
But Sakura's and Tsunade's Punches are Chakra-enhanced Taijutsu.
Kaiji then sat in a Lotus position on the ground, starting to repeatedly practice inhaling and exhaling to discover any subtle outward chakra push that might cause any kind of flicker of activation.
Kaiji practiced it continuously for the next one hour, refining the timing and intensity of a sharp inhale and a forceful exhale.
In the end of the practice, he got the signal of successful activation—
When he started feeling a warm tingle and readiness internally in his chakra.
When he took a sharp inhale of breath and held it, before exhaling in a specific pattern, a subtle, barely visible and pale, almost featureless white, silver mist appeared around him.
His muscles got tensed, and his posture became more rigid and alert.
He tried to stay in that state, but it wore off quickly.
"Damn, It really works, a Success!" Kaiji exclaimed, unable to control his excitement.
For a moment there, he felt his strength increasing, but not only that, he also felt that internally his Chakra also boosted a little.
"I recalls that Eight Inner Gates during use increase Chakra reserves of ninja temporarily—
So it shouldn't shocking if this technique also can do that, since it's like version of Eight Gates."
Kaiji remembered that detail from the anime and mused, "If my Chakra Reserves also increase during activations state, does that means I can use Earth Wall Jutsu or other high rank Jutsu without worry."
He still remembered that Ryun, who had around Genin level chakra, was left breathless with one use of Earth Wall Jutsu.
For any High-rank Jutsu, high chakra reserves are important, which currently Kaiji lacked.
Though his chakra capacity was quite better, it wasn't to the point where he could use B-rank or above rank Jutsu without worries.
But the question was, could he be able to use Ninjutsu while using Seven Heavens Breathing Method?
Even in the anime, there was no indication that Ninjutsu could be used with techniques like Eight Inner Gates and Seven Heavens Breathing Method.
"However, everyone using these techniques lacks aptitude for Ninjutsu and Genjutsu anyway.
That means there is a possibility that Ninjutsu can be used during using Seven Heavens Breathing Activations form," Kaiji remarked.
Even the users of Eight Inner Gates and Seven Heavens Breathing Method are those who lack any aptitude for Ninjutsu and Genjutsu—
Let it be Shira, Rock Lee, and Might Duy; all lacks aptitude for Ninjutsu and Genjutsu Ninja arts.
While Might Guy had some aptitude, however he also chose to become a Taijutsu specialist.
Then, theoretically, the use of Ninjutsu and Genjutsu while in the ''state'' of these Techniques should be possible.
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