Druidic and Clerical spells all seem to fall into the same category of "priest" spells. I don't think that there's really any way to differentiate them.
Nearly all armor has a special effect added that disables arcane spell casting. From what I've seen, the engine onely recognizes three types of spellcasting: arcane, priest, and innate. There seems to be no differentiation between bardic and mage arcane spellcasting or between druidic and clerical spellcasting.
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