Some people with a narcissistic personality type can be termed as “malignant”.
Features of malignant narcissism:
(1) narcissistic personality (with potential for narcissistic rage)
(2) antisocial behavior (antisocial personality type)
(3) paranoid orientation
(4) ego-syntonic and/or sexual sadism
A person with malignant narcissism may become:
(1) a serial killer
(2) a member of organized crime (such as Anthony Casso)
(3) a mass murderer