As the saying goes, "CON is never a dump stat". Unfortunately, that applies here, meaning some of the perks are basically useless. I think maybe "health" should be based on a different stat depending on the encounter type.
Definitely true, especially with the smaller party. The HP scaling on different stats is something I’ve considered, especially in mental arenas. And I’m also planning on some further specialization-like abilities that require things beyond “Just maximize your HP and damage scaling.”
We’ll see though; I don’t want to introduce a ton of complexity just for the sake of being different either.