(Prequel to whenever I get around to the scary untangling part of the Jeanne tag.)
Exactly what it says. I'm guessing part of this tag's existence is a vestige from when jalter and this thing were also implicated to the base Jeanne d'Arc tag, but right now it's just uhh... confusing?
We currently have 5 tags implicated to the base Jeanne tag - Jeanne d'Arc (Ruler), Jeanne d'Arc (Capsule Servant), Jeanne d'Arc (Swimsuit Archer), Jeanne d'Arc Alter (Lancer) which i continue to have SO many gripes with, and Metatron Jeanne. So in order we have original Jeanne, functionally an alternate costume for Jeanne, swimsuit for Jeanne, mistake of an implication, and slightly younger than normal hikikomori Jeanne. Jeanne's no Seiba - her variants aren't THAT much, especially once you exclude Jalter from the mix.
So is Ruler Jeanne supposed to just be for her in her original servant garb? No, based on the implications that tag has (which is almost every single costume for Jeanne) and also just how the tag is being used. So again... what's the purpose of this tag? Just adding another implication level to distinguish Jeanne from... Jeanne in a swimsuit? Jeanne in a school uniform?
I think the Ruler Jeanne tag has some merit as it currently exists as a tag for "Jeanne in her purple dress and armor (which turns white in her third ascension)", but currently that is objectively not how its being used. Mostly just seeing if there's any argument to keep the tag hierarchy as-is.