It like super WinRared stronger genjutsu.how is better than just a normal Genjutsu doesnt the user know its in Tsukyomi?
They know, but itachi is able to manipulate time so much that he can make 3 days out of 1 second. They can't break the jutsu because they're never given enough real world time to effectively use any form of genjutsu release (pain, rotating chakra, reversal, etc.) That and the fact that he can manipulate everything in it from mass, to location makes it even harder to get out and easier for him to kill you if he sees fit.how is better than just a normal Genjutsu doesnt the user know its in Tsukyomi?