Are rules governing dual-classing hardcoded?
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Could we modify the rules that allow only humans to dual class, such that all races could? Or is his a hardcoded limit? What would need to be modified, if this isn't a hardcoded limitation?
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You will be able to open up any class to any race, to allow humans to multiclass and to allow non-humans to dual class, but you will not be able to enable a multiclass combination that didn't already exist, and you won't be able to kit where you could not kit before.