SRD:Tower Shield Proficiency
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Tower Shield Proficiency [General] Prerequisites: Shield Proficiency.Benefit: You can use a tower shield and suffer only the standard penalties. Normal: A character who is using a shield with which he or she is not proficient takes the shield’s armor check penalty on attack rolls and on all skill checks that involve moving, including Ride.Special: Fighters automatically have Tower Shield Proficiency as a bonus feat. They need not select it.