Needs review
Source: Player's Handbook

Description: You are skilled with an exotic weapon

Prerequisites: Base Attack Bonus +1

Choose a type of exotic weapon, such as dire flail or shuriken. You understand how to use that type of exotic weapon in combat. You make attack rolls with the weapon normally.

Special

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. A fighter may select Exotic Weapon Proficiency as one of his fighter bonus feats.

Normal

A character who uses a weapon with which he or she is not proficient takes a -4 penalty on attack rolls.