Ego death is the ancient initiation that is known as spiritual death and rebirth. All humans can experience it and according to the teachings, you CAN change your personality from it but that does not mean you WILL. Maintaining the state of ego death for more than a few seconds on regular dosages is near impossible without proper training and guidance. Most that take higher doses and experience it have no memory of it and also go into hallucinatory states, which appears as complete psychosis until they come down.