4. Being ignored.
This is a no-brainer. Ignoring a narcissist means giving them no supply at all, and without narcissistic supply, the narcissist dies a slow death. Or believes they will. That’s why some narcissists would even rather be hated than be ignored. Negative attention is still attention, and at least it provides acknowledgement that they still exist. When you ignore a narcissist, it’s as frightening to them as being killed. They’re no longer confident they exist without your attention.