(Combat)
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 warpriest 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
Magus with the kensai archetype can gain this feat with his chosen weapon in place of his bonus
Weapon Focus feat.