Had a cool idea for a mountain with hermits on it that get struck by lightning in order to cast it as a spell but I’m not sure how to build a setting around that idea.
What makes these folk a faction is less about what powers they have and more about their active role in the world: what are they trying to accomplish and why?
It’s totally fine for these hermits to just be an interesting feature of that particular area— without any influence on the outside world— but, if you want to factionalize them, they need goals and motivations.
I like the concept. They sound like adherents to a god of lightning or storms. What might such a god ask of their followers?