Izanagi is a jutsu based on Hagoromo's Creation of All Things technique. What it does is cast a "genjutsu on oneself". By using the image creation of Yin Release with the life breathing forces of Yang Release, a person can effectively make some things illusions while some things real. Traditionally, it is used to cheat death. A Sharingan-user will be killed with an attack, but their body will turn into an illusion, and an illusion is produced and becomes real.