[jutetrea]

just as a quick example, check out the urdheim mod and the mytheology mod, both have holy requirements in spells. Mytheology introduces nation-neutral holy spells, for example:

A holy site searching spell
A holy "dome", 1 turn duration
A holy flames from the sky/fires from afar vs. undead

All seem to work very well and could be expanded upon. I like the idea of pretender specific spell boosts just to enhance some of the lesser used pretenders. Even if it was kept simple, say 3 spells per pretender 1H, 2H, 3H specific to that pretender "type/ethos/sphere". Could be very easily adapted from the D&D clerical spheres for general type, then customized heavily for dominions.