Izanagi

Izanagi was a type of genjutsu where the effect was on the user and not on his opponent. Here the caster removed the boundaries between the illusion and reality to the point where the caster can change its destiny or rather control their state of existence.

During the battle the user are fighting with his real body in case the caster received fatal injured or even death their body will simply fades away and return back to reality. But this is only happen in very short period of time.

During the battle of Danzo and Sasuke in order to perform the Izanagi it required a lot of sharingan since Danzo was not an uchiha.