The real Itachi spoke inside the shared mind with clear confusion in his voice.
“Tsukuyomi?
How is it going to help you increase your chakra?” He knew about the Mangekyou abilities that he had awakened after witnessing Shisui’s death but he had not thought much about them since now his body belonged to Julian Itachi answered while he and Sasuke continued walking toward the training grounds.
“It distorts the perception of time for the target.
According to the way you used it in the future against Kakashi, three full days which equal seventy two hours pass inside the genjutsu while only a fraction of a second passes in the real world.
The difference is so large that a short moment outside can become a long stretch of experience inside.
That makes it the perfect method to train the mind and the spiritual energy without spending real years of life.” The real Itachi felt a wave of shock at the plan that was forming.
He asked the next question with open disbelief.
“You plan to use Tsukuyomi on yourself?
The technique is meant for enemies.
And would it even work on you?” Itachi nodded even though the gesture was only inside their shared thoughts.
“Yes.
Shisuis ability caught you in a genjutsu and that illusion was powerful enough to hold even you.
Thankfully I had access to your mindscape and to your body so I managed to break it from the inside.
We also had the Mangekyo already active and that weakened the hold of his technique.
What I am trying to say is that if his Mangekyo ability could work on you then your own Mangekyo ability should work on me as well.” A small smirk touched the face that Itachi controlled as he added the real reason for the risk.
“And with it I would be able to get years worth of training in only a few minutes of real time.
The chance to grow that fast is too valuable to ignore.” The original Itachi understood the full meaning at once.
If Julian entered Tsukuyomi and stayed inside for even one real hour that would equal three thousand six hundred seconds.
If each of those seconds held the weight of seventy two hours then the total would reach two hundred fifty nine thousand two hundred hours.
That number equaled ten thousand eight hundred days or roughly thirty years of unbroken experience.
All of that growth would arrive without the body ageing a single day.
The flesh and bones would stay exactly as they were yet the mind and the spiritual energy would race forward.
Because the training happened inside a genjutsu the muscles themselves would not grow stronger but the spiritual side would rise at a speed no normal shinobi could match.
Even while he saw the possible gain the real Itachi also saw the dangers.
He wanted to be certain that Julian understood every cost and was ready to meet it.
Before he could list the problems, Itachi spoke again, “Yes I know from your memories that I should not use the Mangekyo carelessly because it will cause blindness in the end.
Shisui had already warned you of this.
The more the eyes are used the faster the light fades.
And from those same memories I see that Shisui never learned a way to fix the damage so I will have to search for a solution myself when the time comes.” He continued with a practical limit that lowered the risk.
“Anyway I could use the technique for half an hour without placing heavy strain on the chakra or on the Mangekyo.
Since I am technically activating the ability only once the damage should stay small.” The original Itachi found the explanation yet other problems remained.
He spoke the next concern in a careful voice.
“Fifteen years of information cannot be processed by a human mind even if the real time is only half an hour.
The brain would simply shut down under the weight of so many new memories.
The flood would be too large for it to contain.” Itachi answered with a calm counter point that drew from their recent experience.
“I had assumed the same danger.
But we already received each others full memories in only a few seconds and we managed to process them.
The transfer still caused a headache yet neither of us collapsed.
That shows the mind can accept large amounts of knowledge when the conditions are right.” He offered a further plan that used tools already known to Anbu.
“But let us assume that the easy transfer happened only because of our unique situation.” “From your memories I know that Anbu are taught special memory sealing techniques so that important knowledge cannot be pulled out of their minds by force.
We can use those same seals.
I will lock the fifteen years of training behind seals and then remove the seals one by one over ordinary days.
That way the information enters the conscious mind in safe pieces instead of one crushing wave.” The original Itachi felt genuine astonishment at the speed and clarity of the planning.
The man who had arrived less than a day earlier was already building a complete system that used every tool the Uchiha and the Anbu possessed.
One final obstacle still stood in the way and the original Itachi knew of no easy answer for it.
He asked the question in a quiet and serious voice.
“You would be living through fifteen years of loneliness inside that world.
The only company would be whatever illusions you create.
Would you be able to handle so much time alone with only your own thoughts?” Itachi gave a short sad chuckle that carried the weight of his previous life.
“It is not like I have anyone in this world that I really know.
The faces around me belong to your memories not to mine.
The loneliness is already familiar.” He then offered a softer solution that made the long isolation less empty.
“Well it is a genjutsu so I can make my younger brother appear there.
I can shape the world in any way I need.
I can sit with Justin and talk the way we used to.
I can also spend the years exploring every detail of chakra and every new idea that rises.
There is so much to study and so much to test.
You do not have to worry about me falling apart.” Itachi finished the plan with one clear request.
“You just have to bring me out of the genjutsu after the required amount of time has passed in the real world.
I do not think I will be able to release the technique from the inside once I am deep inside the training.” The original Itachi listened to every part of the plan and weighed the risks against the possible gain.
After a long moment of silence he gave his answer in a steady and accepting voice.
“Very well.” ——-Author Notes——– Thankyou Kris Newland and David M.
Sep for supporting me!