Narcissism is generally seen as a negative trait so there already isn’t a non-derogatory way of calling someone a narcissist. Also, there is an acknowledged difference between being a narcissist and having NPD so as much as many here would probably say Empress has some kind of disorder, I bet very few have the credentials to diagnose which means it’s the former, and if we’re being completely honest, it’s a very practical word to describe a person’s behaviour. So I guess it has to be a “chill out, snowflake” moment for you.