Know Thy Enemy (3.5e Feat)

Special: You may take this feat more than once, choosing a different category of Favored Enemy each time. You may not choose this feat as part of the Problem Solver ability of the Fighter. A Ranger who takes this feat may elect to instead add a new Favored Enemy to his list but the Favored Enemy granted by this feat does not add an additional +1d6 to the Ranger's Favored Enemy dice pool.