SRD:Exotic Weapon Proficiency
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Exotic Weapon Proficiency [General]
Choose a type of exotic weapon. You understand how to use that type of exotic weapon in combat.
You make attack rolls with the weapon normally.
A character who uses a weapon with which he or she is not proficient takes a –4 penalty on attack rolls.
You can gain Exotic Weapon Proficiency multiple times. Each time you take the feat, it applies to a new type of exotic weapon. Proficiency with the bastard sword or the dwarven waraxe has an additional prerequisite of Str 13.