@MalroktheIII:
I'm guessing, of course, but:
- Some spheres probably won't have any terrain effects as such. Instead, things like Revenge would firstly manifest through worshiper doctrine, and possibly secondly as a skew in the propensity for creatures within the sphere's influence to select that course of action, although that could be tricky to implement.
- In the combination case, the above could apply, i.e. worshipers in particular would seek fame in its many forms and engage in rumor mongering (which might assist in the fame creation process in this particular combination). Non worshipers within the influence ought to be skewed towards fame seeking and might have a higher probability of sharing rumors (or a lower trust threshold for it).
- Intersecting spheres would probably overlap as the default, and clash when conflicting. Thus, you might be blessed with luck while cursed with a shortened life span, or many crops might die due to a blight, but the ones that don't might be bountiful due to a blessing of bounty. When spheres clash the end result would likely be an average of their respective power in the area, possibly with a random factor. Obviously, implementing all variants (or, rather, a system that generates effect combinations) will probably be tricky, not fully thought out yet, and probably run into snags that will force things to change.