Rangers and the Gods

[Ail]

Thank you for all the answers. I think the best bet really is to interpret the spells as a mystic connection to the land. They function as rituals performed for special functions, or even as simple as the sign of Jhebel Sag in the cartoon Conan the Adventurer (1992, iirc). And since that is a mystic power, it taxes certain parts of the self, probably a less obvious part of the mind that takes time (eg, 3 levels) to tap and that does not forbid the ranger from using his mind and body to the most in everything else.

I say this because I don't like the explanation 'the spell taxed you overmuch and you're too tired to cast another' because he can still have enough stamina to run for the whole day or do complicated math without problem.

Well, that's it.