|d20 Modern System Reference Document
An advanced class represents a focus and a calling for the experienced adventurer. It provides a specialization and a range of power and ability to give a character that something extra to set him or her apart.
Although each advanced class naturally builds from a certain basic class, every advanced class is available to all characters who fulfill the prerequisites of the class, regardless of what basic classes they have gained levels in. The associations between basic classes and advanced classes are summarized on the following table.
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