On the 124th day, luck finally smiled on Kenshin. He managed to create a prototype of the chakra suppression formation. After it was applied to the cuffs and Natsumi put them on, it was extremely difficult for her to form any technique or walk on walls, but her enhanced physical strength did not go anywhere, and the chakra in her muscles refused to "fall asleep". But a beginning had been made, and Kenshin only had to refine the formation to obtain a formidable ace up his sleeve against disobedient kunoichi or valuable but strong enemies.
On the 125th day, Ichiro found his father and reported joyful news.
"Father, it seems my chakra has become higher quality!" he said with a proud look.
Kenshin instantly looked at his "status" and was surprised.
Name: Nakayama Ichiro
Age: 20 years
Talent level: 16
Chakra quality: 3
Chakra amount: 3320
Chakra control: 51%
"Hm, indeed, your 'chakra quality' has increased to three. Moreover, the amount of chakra has grown a bit, and control has improved slightly. Well done, Ichiro!" Kenshin praised him and patted him on the shoulder.
"Thank you, father!" he sincerely replied.
Then they conducted several experiments, and Kenshin finally understood what this strange indicator called by the system as "chakra quality" gives. Ichiro's fireball did not become larger, but it became much more destructive. The temperature and density of the fire increased by about twenty percent. The special reservoir with water, which previously evaporated by 70%, was now completely dried by the fireball hit.
On the 126th day, the second batch of blue sage ripened; out of 34 planted seeds, only 30 fully ripened. If someone engaged in industrial cultivation of blue sage had seen Kenshin's successes, they would immediately spit out all their insides from insane greed.
A great success was already considered if at least 10 out of 30 planted seeds grew and ripened. Therefore, Kenshin's results were completely beyond the dreams of anyone engaged in cultivating this capricious plant. Usually, blue sage had huge requirements for soil, lighting, fertilizers, and quality watering. It grew for about two months, as opposed to ten days with Kenshin's formations.
From the thirty bunches of blue sage, Kenshin decided to use twenty for seeds and the remaining ten for his own needs. In the future, he wanted to have his children drink blue sage tea every day. Blue sage tea had a very beneficial effect on chakra circulation and production, and on average improved shinobi training results by 10-15%. Wealthy Elite Jonin or Kage-level shinobi could take baths from blue sage decoction and improved their training indicators by a record 30%. In the future, Kenshin planned to provide such baths for each of his sons at least once every few days.
In the evening, he brewed blue sage tea and let his sons try it.
"Hm? What is this?" Ichiro muttered with interest, feeling the unusual taste.
"This is blue sage tea, drink it. It should stimulate the chakra in your body. Do you feel anything?" Kenshin asked his eldest son.
"Mmm, something unusual, I can't describe… As if my chakra has become a bit more rampant but at the same time more malleable… Strange feeling…" Ichiro muttered, focusing on his sensations.
"Yes, father, I feel the same as big brother. As if in the lower abdomen, in the chakra core, a storm began that made the chakra circulate faster through the channels!" Third declared with delight.
"Yes-yes, father, I feel the same!" Fourth confirmed and took another sip of tea.
After the "tea party", all of Kenshin's sons went to training and spent several hours in the gym until finally Third's voice sounded through the telepathic link: "Father, father! We did it, you have to see this!"
Kenshin immediately went to the gym and saw incredibly pleased Third and Fourth. To his father's question "What happened?" they silently formed seals in a few seconds and synchronously shouted:
"Katon: Goukakyuu no Jutsu!" After a few seconds, half-meter fireballs appeared, rushing to the far end of the room and crashing into the wall, enveloping it in fire from top to bottom.
"Well done! You did excellent! But do not get conceited. The world is full of shinobi who will destroy you with one finger, so train harder!" Kenshin said solemnly, wanting to ignite a spark in their hearts, which, thanks to their complete worship of their father, was not difficult.
"Yes, father! You can rely on us; with big brother and us standing guard — no one will dare enter our home and leave unharmed!" Third declared, and Fourth nodded furiously, supporting his brother.
*****
On the 129th day, luck finally smiled on Kenshin. He managed to refine the chakra suppression formation. Putting leather cuffs on Ichiro, he decided to personally check how much the combat power of a shinobi without chakra changes.
Going out onto the tatami with his son, Kenshin for the first time in a long time felt slight relaxation. Ichiro's incredible speed and strength returned to initial values. All chakra in his body was blocked and "asleep", so Kenshin gave his son a worthy fight and in the end with difficulty but won.
"Incredible bracers…" Ichiro muttered, removing the cuffs. As soon as they were removed, he took a deep breath as if reborn. His perception greatly improved, and unable to resist, he jumped up, spun, landed on the ceiling, stretched his shoulders, and instantly appeared next to his father.
Kenshin still could not get used to the incredible abilities of chakra possessors and only sighed.
"Father, these cuffs are unlikely to block the chakra of someone above Chunin level. When my chakra was blocked, I vaguely felt that if I become much stronger, I can easily fight the blocking effect." Ichiro noted.
"Good. I'll try to think of something and refine the formation." Kenshin said. But deep down he believed he was unlikely to come up with anything new before obtaining new knowledge.