"Alright, I will go into more details. There are two types of illusions, active ones that require chakra and passive genjutsus. They are like environmental and visual illusions, basically ones that affect the senses and are generally easier to escape. Active genjutsus include those from Sharingan, normal genjutsu, and sound genjutsu- these are more complicated and harder to deduce because they are generally more advanced and can even manipulate multiple senses. To successfully cast an illusion, you would need to gain control of the enemy's chakra flow in their cerebral nervous system, through your chakra obviously, which would allow you to affect one, or multiple senses out of the five senses. It is generally not a popular area of ninjutsu, but some like Uchiha's, or Kurama clan's are wellrenowned for their extremely advanced genjutsu usages. There are layered genjutsus, where breaking the first illusion will lead to a second one and is more complicated than a normal illusion because they mix two illusions into one. When creating layered illusions, you'd need to use the higher rank first to make sure both illusions are set in place, otherwise only the stronger illusion will be created.
Now tell me, how does one dispel an illusion?" Nico Robin eagerly asked, and afterwards, sat down as she patiently waited for the students' reply.
OOC: Yes, I'd like you to go into detail on the different ways to dispel, and to recognize an illusion.