My experience with a clinically diagnosed narcissist, which is very rare considering, was with an ex I spent/wasted seven years of my life with, and subtly different from what you said. She saw everyone else as superior but unjustly so. Everyone that wasn’t serving her interests was an enemy. The insecurities of feeling inferior to everybody manifested in a projection of superiority but under it all it was just a mask to protect her fragile ego. She would do anything and everything, in the moment of her current environment to get what she wanted. She only cared about anyone in so much as they validated her desire of inflated self worth, her own children included. There was a sliver of hope after a few years of therapy but as real as the temporary empathetic soul briefly emerged all it took was a light switch moment and suddenly, like a light switch, that just became another momentary blip to then be used as an additional tool in her toolbox to socially destroy anyone that wronged her. Even after grey rocking her for over two years, following our seven year relationship, did I start getting left alone (luckily her kids weren’t mine, still feel for them but they are trying a master class in manipulation and strategic mood swings). I’m sure she got distracted with her next victim and I no longer fed her need for control enough so she lost focus but it was the most miserable decade of my forty odd years on this earth. I love her, or who I thought she was anyway, it still hurts thinking back but it was never really her, who I thought she was didn’t exist.