Priests or priestesses are the people who specialize in the worship of the Animar. Some of these priests are elementals, and with enough practice they become Masters. Masters have all the training a priest does, plus all the extra stuff for their element. Masters are the ones qualified to teach the elements to other villagers (Ex: Master Horsfell is a priestess and a Master of Light.) Apprentices are usually younger people who are studying to become a priest, regardless of whether they want to/can be a master or not.

Temples also serve as hospitals, since temples Masters are always very trained in magic. So Masters of Water and Light are the go-to healers in Orewyn. There are still physicians and apothecaries that aren’t elementals, but there is a huge advantage in being one, so many tend to be. This is the case in a lot of professions, like a lot of blacksmiths tend to be earth elementals and and sailors tend to be water elementals. The thing for physicians and apothecaries is that they might actually know a lot more about anatomy and the like,
not just healing.