Responses
My understanding was that espers are capable of using a higher percentage of their brain than normal people, but it taxes the body (hence the need for guides.) The brains primary base function for everyone is self-preservation so it starts throwing out hallucinations to make you stop overusing it.
It's a little pseudoscience to explain an esper reality.
Am I the only one who didn't understand how the hallucinations and awakening powers relate like do everytime they use their power they get a nightmarish hallucination?