Board Thread:Versus Debates/@comment-26636534-20180830184727/@comment-26107879-20180917054450

It was Demonic Illusion: Shackling Stakes Technique but even then in the Manga it was shown to prove ineffective. Orochimaru shrugged it off and went to perform a Ninjutsu but the Genjutsu was only to stun lock him so Itachi could get close enough to cut his arm off. It wasn't the Genjutsu that really did a number on Orochimaru, it's what happens before he can do something. Itachi capitalizes on his stun lock and strikes. No one is immune to Genjutsu. Even people with Sharingan have shown to be caught in Genjutsu from time to time. They just can recognize it instantly and break free. But that means it isn't instantly broken and for that brief time, you are stun locked. That's why Genjutsu is such a cool ability. Cause even if the target can break free, as they are breaking free you can attack them.