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Back when he read the manga in his previous life, there had been one point Wu Yu could never let go of: during Konan's battle with a hundred billion Explosive Tags, the masked man—Obito Uchiha—had clearly been constantly using the intangibility ability of his Kamui Mangekyō Sharingan, yet his right eye had stubbornly remained in the Three Tomoe Sharingan state.
It could be explained as the author forcing himself to draw it as Three Tomoe in order to conceal the masked man's true identity, while using it as a Mangekyō—but it still felt like a glaring bug, a flaw that kept resurfacing in one's mind from time to time.
But after Mysterious Kaguya's brief explanation, Wu Yu suddenly understood.
Obito Uchiha's right eye might not have needed to display the Mangekyō state at all when using its ocular techniques!
It might not even have required the right eye to exist at all.
Shadow Wu Yu lowered his head in thought.
Clearly, all Mangekyō Sharingan ocular techniques could roughly be divided into two categories.
Visual-type.
Non-visual-type.
Visual-type ocular techniques—
[Tsukuyomi] definitely counted. One had to make eye contact with Itachi Uchiha's left eye to be caught by it, and the effective distance apparently depended on the visual clarity of both Itachi Uchiha and his target. If neither side could even see the other's eyes clearly, and they could not make eye contact at all, then what kind of visual genjutsu would that be?
Without question, Itachi Uchiha's worsening vision due to the Mangekyō's side effects was also an enormous weakening to his Tsukuyomi ocular technique. His eyesight had deteriorated to the point where he practically had to stand right next to an enemy to cast Tsukuyomi accurately.
[Amaterasu]? The black flames that burned along the Mangekyō Sharingan's line