If your duel class it gets split 50,000/50,000.
As I have not finished adding it to everyones character due to RL your will get the 50/50 split.
As of right now I only think Kyle went up a lvl as updated on his character.
And thanks for the compliments your "brown nosing" is working

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Edit: you do get Exp for your classes sepereatly depending on what you do like casting spells or doing mage things you get mage exp. For opening locks and trap searching Thief Exp..