You have mastered a wide range of weapons. Your training with one specific weapon now extends to other weapons of a similar sort.
Martial

Weapon Focus, Weapon Specialization, Base attack bonus +8, Weapon Proficiency with selected weapon

Slashing Flurry, Crushing Strike, Piercing Thrust, Weapon Supremacy

When you select this feat, choose bludgeoning, piercing, or slashing. You must have Weapon Focus and Weapon Specialization with a weapon that deals this type of damage. When using any weapon that has the damage type you selected, you gain a +2 bonus on attack rolls and a +2 bonus on damage rolls. In addition, you increase its range increment by 20 feet if applicable.

You can select this feat more than once. Each time, you can select a new damage type.