When you become enlightened enough you are able to see that the truth is chaos and that "reality" isn't much more real than a dream. When this happens you begin to lose your grip on reality. The more you see of the truth the harder it is to keep hold of reality. You simply go insane. Once you've fallen far enough into madness it begins manifesting itself on your physical body. Since the world is sprung from chaos all creatures who are caught by this type of madness has a natural urge to protect it from it's enemies; primarily Stagnation.