As it should be. If you are a priest, you must worship a god. In favor the god would grant you spells.
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doesn't really work well with core domains and fr gods. bane, as an example, gots hatred and tyranny as domains. sure, you still got choice of evil and law, but those would be only choices. valkur and aerdrie faenya, fringe fr gods at best, sudden becomes real popular 'cause they is only fr gods that offer air and good? poor josh gets stuck with his red knight priest having a fixed choice of law and war.
nwn were creating a rules system that were gonna be for playing beyond fr... the toolset, as such, has been used for greyhawk and dl and a multitude of custom worlds... and since the bio developers had no hope of making all fr domains available, much less all d&d domains, they stuck with the core... and the core rules allow you to choose any two domains... and there ain't no requirement for worship o' a specific deity. makes sense to us that 'cause rulset had to work for more than fr core would be the default.
however, they really screwed the core domains up badly. it not bother us that the domains and spontaneous casting rules ain't even remotely similar to da rules, but if you is gonna throw away the rulebooks, then how do you come up with the woefully unbalanced crap that is the nwn domains? the core d&d domains may not be balanced, but they is a damned sight better than the crazy fr nonsense. unfortunately, the biowarians really did a poor job of implementing the core domains... and numerous bio developers has admitted that even they were displeased with their implementaion of domains... didn't even put up a fight when Gromnir blasted 'em.
HA! Good Fun!
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I said it once, I will say it again, down with third edition rules, stick to using AD&D rules.