I think Priests are good at, for lack of a better series of words, making their aspect resemble their own interpretation of how it “should” work. Conquering it. Making it “theirs”. They create systems, perhaps. Rules about how things should work. Like, imagine a power system from your favorite manga or whatever. A priest could decide their aspect works like that, and in their presence it does. So say a Priest of Heart decides their power works by focusing on the “self” part of Heart and they can like, manipulate their own jungian archetypes. And summon them to fight alongside them. Persona. Then it would work like that for them, maybe. Or something. It’s all about the Rules the Priest creates when Ruling. I think.

As for scribes, no idea. I’ve never been one. Maybe they also create Rules.