Shisui's initial mangekyou Sharingan ability? Kotoamatsukami, known as one of the strongest Genjutsu in the Naruto universe, is a Mangekyo Sharingan power that Shisui Uchiha had. Shisui may use this talent to cast a strong Genjutsu on one or more individuals at the same time and influence them without their knowledge.
It's not going to require shisui every ten years to activate it. He had previously used it against concealed mist ninjas and intended to use it on Fugaku. I know that wasn't the same period, but the time with the hidden mist ninjas and Fugaku can't be 10 years apart. I mean, how old was Shisui in the first place, and you claiming he could fight Kaguya with that is a big cap...... The otsutsuki clan is immune to all genjutsu....so do your homework and make sure you have evidence to back up your claims............
Shisui was one of the few persons who succeeded in awakening the Mangekyou Sharingan. His Mangekyou allowed him to see Kotoamatsukami in both eyes. The Kotoamatsukami's particular ability enables the user to enter the mind of any person within his range of vision and manipulate them into believing false experiences flawlessly and fully, acting on them as if they were genuinely acting on their own free choice. It is often recognized as a one-of-a-kind genjutsu of the greatest level. Kotoamatsukami
Tsukumo: After Shisui produces his Susanoo's upper-body, it opens its ribcage to reveal its chest before firing a volley of enormous, green-colored chakra needles at breakneck speed. (30 damage, cooldown of 30 seconds, blockable) Shisui uses Kotoamatsukami to prevent the opponent from attacking anybody on the other side for 5 seconds (no damage, 50 sec cooldown). unblockable)