The dark triad personality disorder consists of qualities from narcissism, Machiavellianism, and psychopathy. A narcissist lacks empathy, a Machiavellian is manipulative, and a psychopath is remorseless.
some people wonder if narcissists, sociopaths and psychopaths don't know they are toxic and are hurting people. i assure you they know. they believe all their actions are valid so guilt is never an issue . toxic people know what they do.