[Theory] Tsukuyomi can theoretically be used as an interdimensional training realm

Byakusharinnegan

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Tsukuyomi, the fabled jutsu of Uchiha Itachi, has received much hype over the length of the series for its destructive power. As I've been skimming through earlier chapters, however, I've seen another possible use for this Genjutsu.

In the first on-panel use of this technique, Itachi caught Kakashi in an illusion that made him feel as if he were being pierced by multiple katana over the stretch of three days. What got my attention was the dialogue in the lower right panel.
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Itachi states that everything, even time and matter, are under his control in this illusion; essentially the person trapped in it is subject to whatever the user decides to spawn. Hence, the inspiration for Madara's Tsuki no Me plan.

But what if the intent of the user wasn't to torture or otherwise harm?

As we know, Naruto left for a three year training trip with Jiraiya, after which he came back with improved seals, taijutsu, and ninjutsu. Was such a lengthy trip necessary for said results? As Kakashi himself said, Itachi made it seem as if

If a user of Tsukuyomi were to create a copy of themselves in the illusion to accompany the target, and teach the seals of certain jutsu that would usually require a large amount of time to learn in a mere instant, this jutsu becomes more than overpowered; There is nothing to suggest that Itachi can't make the time seemed to have gone by in Tsukuyomi more than a mere three days. Now obviously the physical effects of this jutsu won't carry over, yet this still interests me.

Would you agree?
 

Souji

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So essentially, a Hyperbolic Time Chamber?

Yep, I could see it. Nice theory.
 

Yanks

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This aint no Time Chamber lol
 

magicman420

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i agree with you depending on what the user wanted the target to see tsukiyomi could be used for anything
 

Punk Hazard

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While it could work the way you're saying, it's not "interdimensional" since it's all in the inflicted person's head.
 

nandachikara

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It will be faster than naruto using tajuu kage bushin for training.nice theory mate
 

Zavage10

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I always thought about it like that too!!
 

Thundercles

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No. What you are speaking of is the equivalent of the matrix. You could "learn" all the fighting techs, but actual use with your body is another story. Also, his jutsu isn't "fabled".
 

Tera Path

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This is kind of how it goes, this would actually be handier for knowledge, rather than actual techniques.

Your real body wouldn't of actually learned xxx jutsu, but your mind has.
So either you have just gotten a small advantage, but you still need to learn it.

If Naruto was under Itachi's genjutsu than he actually still wouldn't be capable of such things, even if his body aged in the genjutsu, his real body would still be normal and incapable.
 

Mypower

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Chill bro, that sh*t would be OP as f*ck
 

Byakusharinnegan

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This is kind of how it goes, this would actually be handier for knowledge, rather than actual techniques.

Your real body wouldn't of actually learned xxx jutsu, but your mind has.
So either you have just gotten a small advantage, but you still need to learn it.

If Naruto was under Itachi's genjutsu than he actually still wouldn't be capable of such things, even if his body aged in the genjutsu, his real body would still be normal and incapable.

Yeah, that's pretty much what I meant. I wrote this in a hurry, so I didn't have time to embellish.
 

Mellanoma

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Yeah there were a lot of theories about Itachi teaching Sasuke Izanagi and Izanami when he used tsukyomi on him in the vs kabuto fight
 

Itachi Edo

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I've always thought this was possible ever since Madara trained Obito inside a genjutsu. It's possible.
 
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