Malignant narcissism is a psychological syndrome comprising an extreme mix of narcissism, antisocial behavior, aggression, and sadism. Grandiose, and always ready to raise hostility levels, the malignant narcissist undermines families and organizations in which they are involved, and dehumanizes the people with whom they associate.
Malignant narcissism is a hypothetical, experimental diagnostic category. Narcissistic personality disorder is found in the Diagnostic and Statistical Manual of Mental Disorders (DSM-IV-TR), while malignant narcissism is not. As a hypothetical syndrome, malignant narcissism could include aspects of narcissistic personality disorder (NPD) alongside a mix of antisocial, paranoid and sadistic personality disorder traits. The importance of malignant narcissism and of projection as a defense mechanism has been confirmed in paranoia, as well as “the patient’s vulnerability to malignant narcissistic regression”.
Please check out this list of Narc terms that link to some really great blogs about surviving/escaping your NARC.