Due to Mary's consistent training, Goddess's Priestesses had managed to secure a foothold in Leon's mind, despite his not having yet spoken with one in person.
In Leon's eyes, they were akin to the final boss in a game, formidable enemies with powers at least as potent as Scepters but capable of using real magic to some extent.
No one can heal another; such magic did not exist for those under the Divine Ones. However, they could perform healing to some extent. The magic they wielded was akin to that of a Demigod, though obviously much lower in power and more limited.
They were enigmatic figures who appeared in the news sporadically, addressing topics they deemed necessary to attend to. They were significant figures, leading one to wonder about the heights of societal stature one must achieve to meet them in person.