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Modified Weapon Proficiency (Combat)

Source Adventurer's Armory 2 pg. 11
You know how to use a specific weapon skillfully, even when it has undergone modification.

Prerequisites: Proficiency with the selected weapon.

Benefit: Select one type of weapon, such as longsword. You are always considered to be proficient with modified weapons of that type.

Normal: A modified weapon is treated as one category more difficult to wield.

Special: A warpriestACG with the focus weapon class feature can gain this feat with his deity’s favored weapon in place of his bonus Weapon Focus feat. A magusUM with the kensaiUC archetype can gain this feat with his chosen weapon in place of his bonus Weapon Focus feat.