To Lure Them
The other way to neutralise a vindictive narcissist is to offer him continued Narcissistic Supply until the war is over and won by you. Dazzled by the drug of Narcissistic Supply – the narcissist immediately becomes tamed, forgets his vindictiveness and triumphantly takes over his “property” and “territory”.
Under the influence of Narcissistic Supply, the narcissist is unable to tell when he is being manipulated. He is blind, dumb and deaf to all but the song of the NS sirens. You can make a narcissist do ANYTHING by offering, withholding, or threatening to withhold Narcissistic Supply (adulation, admiration, attention, sex, awe, subservience, etc.).
Source: Vindictive Narcissists