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Remove the save vs spell required for Know Alignment
For whatever reason Know Alignment was originally given the requirement of having the target avoid a save vs spell against it (at -2 mind you but still). I'm sure there are very good PnP reasons for this but in the world of BG this takes a spell that had already pretty limited usability and kicks it thoroughly in the crotch.
Detect Evil, a lower level spell than Know Alignment, doesn't require a save vs spell. Know Alignment however does. Due to this I think that the save vs spell requirement for Know Alignment should be removed.