"Alright, now the last way of breaking a Genjutsu, is to introduce a foreign chakra, into your chakra flow. This would reset it, and cause your chakra flow to go back to its normal state.
What is foreign chakra, and how is it introduced?. Well, Foreign chakra comes in various forms, like for example, activating a Curse Mark, or entering into Sage Mode, having a Bijuu help you (if you're a Jinchuuriki) or if you have a partner on the field, who uses the chakra transfer technique on you to introduce his chakra into your system, would also suffice.
So, there we have it. Pain, powerful surges of chakra, and the introduction of foreign chakra into your system. Now, remember, before using any of these, you must first realize you are in a Genjutsu. We already covered that part though, so last but not least, Genjutsu Layering. What can you tell me about that?"
Dean asks, as he crosses his arms, and waits for his student's answer.