Paladin, Gunslinger, and Cavalier

These three classes are each similar to Warriors in that they are trained in physical combat, but they are also each primarily driven by a greater cause. Each of these classes has a greater understanding of magical and spiritual energy than a Warrior and they often spend their careers hunting down fiendish monsters that use magical powers, hence they have spent time learning to resist such attacks.

These three character classes are the most balanced of all character classes in the areas of Saving Throws: their rigorous training and beliefs have encouraged them to have no weaknesses, though this comes at the cost of having no special resistances. This fits well with their beliefs regarding the need for a balance of skills to be successful in adventuring and in life.