From the introduction: Sometimes it’s just not enough to be a Fighter, Thief, Cleric or Wizard. Each of those classes can be fun, but even these four archetypes can vary from culture to culture and campaign to campaign. Even in fantasy literature no two fighters are the same, even if they have similar characteristics and backgrounds. Lancelot is different from Arthur, yet both are undeniably paladins. Robin Hood is different than Ivanhoe though both are warriors.