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Patricia's Class, Gardenia Knight, was certainly unique, and they seemed to be all like that in her family. Flashy, charismatic knights that wielded rapiers and wore a lot of bright colors, specially ribbons and fashion with their armor. Every knight family had their own classes they usually specialized, magic or techniques they perfected through generations that manifest as new classes.
Or other times, like with Joustin, new Classes can be born spontaneously based on their actions through childhood, their devotions and also what they seek. While Players can choose between a huge list of classes, the inhabitants of Arcadia can only work on what they get naturally.