Separating from an abusive narcissist is difficult: they don’t take rejection well. And if the ANarc has some sort of legal right to live in your home, there has to be a compelling legal reason to actually change the locks...as hugely tempting as that is... otherwise they have a right to call the cops. On the other hand, if you find yourself locked out or in...you have the right to call the cops, too...
Any lies and threats you may encounter are just there to control you—they aren’t the truth. Find people who keep you grounded in reality and who are good for you—they’re the first line of defense against a manipulator.