If narcissists are able to psychologically penetrate their victims is this skill part of the disease or it something else?

Narcissists may engage in psychological manipulation and exploitation of their victims, but penetration isn't a specific term used in this context. Narcissistic personality disorder is a mental health condition characterized by a pattern of excessive self-involvement, arrogance, and lack of empathy. It's important to remember that individuals with NPD vary in their behaviors and actions.