Many people believe that the Eight Gates can provide immunity to Genjutsu, based on roughly two points.
First, after opening the Eight Gates, Chakra becomes extremely violent, which means it meets the condition of disrupting Chakra flow to release Genjutsu.
Second, the Eight Gates continuously cause damage to the user's body, which means it meets the condition of releasing Genjutsu by harming oneself.
Therefore, it's believed that ordinary Genjutsu is ineffective.
But these are all speculations from us Hokage enthusiasts or fanfiction authors.
And what does the official setting say about what happens when the Eight Gates encounter Genjutsu?
The answer is, we don't know, because the two have never met.
(??ヮ??)?
Here, I'm analyzing based on Guy and Kakashi's explanations and Rock Lee's performance during the Chunin Exams.
Opening the First Gate releases the brain's limitations, allowing one to unleash 100% of their body's power.
Opening the Second Gate releases fatigue limitations, forcibly granting stamina.
Rock Lee didn't show any obvious Transformation with the first two gates, only using the Hidden Lotus.
When he opened the Third Gate, Rock Lee's hair stood up and his skin turned red, which can be considered a surge in his Chakra.
When he opened the Fourth Gate, Rock Lee's body began to suffer damage, with muscle ruptures.
Then he kicked Gaara all over the place.
Opening the Fifth Gate, Rock Lee only made three movements: throwing a punch, pulling himself back with bandages, and kicking again, then his body was severely damaged, and he fell to the ground, almost losing his ability to move.
So, the conclusion is that immunity to ordinary Genjutsu is possible after the Third Gate, but there's no conclusion for the first two gates.
Moreover, even Guy specifically practiced the skill of only looking at the enemy's feet to judge their movements in order to cope with Kakashi's Sharingan, so Genjutsu probably isn't a problem that can be solved by opening one or two gates.
If these still can't convince the big shots who like textual research, then forget it. Anyway, the original Hokage author didn't explicitly say whether the Eight Gates are afraid of Genjutsu or not, so we'll decide. Our book's setting is:
The first two gates do not provide immunity to Genjutsu, ordinary Genjutsu is ineffective after the Third Gate.
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