People with Narcissistic Personality Disorder or strong narcissistic traits, depend emotionally on others to sustain their sense of identity and regulate their self-esteem. They get their Narcissistic Supply from the attention and admiration from others, or by asserting their superiority. Any Target is a potential source of supply. Without suppliers, Narcissists are empty, soul-less shells. If a source of Supply pulls away, they may attempt to Hoover them back and/or look for other sources of Supply.