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I played through using all the classes and trying out specializing in each of the traits. Intelligence isn't as important because you'll easily get enough points to master your specialized weapon type and armor regardless. But really, it's not going to hurt you too much no matter where you put your points. As far as skills go, by the end of the game you'll be able to get almost everything in your trees. I would browse through your skill tree and prioritize getting to a stun or knockdown skill, those are the most important skills in the game and will make many a fight much easier.