Sleigh Beggy or Slay Vega?
It literally means, “little people” kinda like the equivalent of fairy in English. Which actually sits perfectly.
In Chise’s use case, the term is used to make her stand out.
In layman terms, it means she is an extraordinary and rare individual.
So while, the scalnator’s intended meaning for “Slay Vega” may have been THE DEAREST CHILD OF NIGHT , it’s actual meaning to English speakers is to kill a star.