Pinner: "Combined, the Dark Triad traits in another person close to you can be detrimental to your mental health. People who score high on the traditional Dark Triad show a pattern of behavior that combines the worst of all worlds. When someone gets in their way, they act out aggressively to take what they want. If you sense that someone might have the Dark Triad traits, consider yourself warned."
Fact sheet: The dark triad The Dark Triad is a set of three personality constructs: Machiavellianism, subclinical narcissism, and subclinical psychopathy, which have been deemed to be socially aversive1