Mages - Subclasses
If your subclass gives a free talent, then you will always have that talent, regardless of whether or not you fulfill the requirements. If it conflicts with one of your existing talents, you will lose the old talent.
If your subclass gives power bonuses, you must have at least 1 rank in the power before you will benefit from that bonus. The bonuses count as ranks, except for meeting the requirements to raise other powers.
Please, note that the classes (namely class powers) are still under heavy development. Since the website cannot retrieve information from the mud at this moment, the most up-to-date information can be found from within the game.