Narcissists easily rage because they are always angry on the inside. Their heart is full of rage waiting to emerge at the slightest challenge to their flawed character.
Any suggestion that you disagree with them or don't care to do what they do is met with this rage, an intimidation tactic to control those who they are unable to control.
Narcissists hate anyone they cannot impress or control through manipulation and intimidation.
The only way to be freed from the narcissistic rage and disquieted spirit is to confess the sin of selfishness and desire to be changed by Christ.
Salvation in Christ is the only answer to the problem of narcissism for the individual who is in bondage to it.
Romans 6:22
"22 But now having been freed from sin and enslaved to God, you derive your benefit, resulting in sanctification, and the outcome, eternal life."
Sanctification is the ongoing work of the Holy Spirit in our lives to become more holy. We are not sinless as believers but we do sin less as we move through life with the Holy Spirit.