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First off a class upgrade is a way to improve your skill. Such as when you become level 15 you get to get dual weapons, which bascially allows you to use to weapons at once, such as two swords, a bow and a gun. But then at level 30 its your main class upgrade which decides how you will fight throughout the rest of the game. Such as i am a hunter/archer only level 20 but when i get level 30 i will pick ranger because to me it seems better than being an assassin because you can shoot from long range doing less damage to you. So i hope this helped a little bit :D

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13y ago

What else can I help you with?