That's where I stop thinking about spirit stuff. logic stands to reason that if there is a spirit for the moon, there should be a spirit for the sun at least, if not every celestial body. if there is a spirit for the ocean there should be a spirit for the sky and earth.
We already know hei bai is a forest spirit but there it is again. is there a desert spirit, swamp spirit, volcano spirit? that is why I stop thinking about spirit stuff, because its a borderline plothole if not just a huge mystery in the lore.
Still love this show and its worldbuilding but everything having to do with spirits is so complex it uninterests me from stress alone.