A shamshir is extremely similar to a scimitar in it's shape and design, and actually, a shamshir, in the hands of anyone without the appropriate exotic weapon proficiency feat, will act as a scimitar. However, there are certain characteristics unique of the shamshir that, with extensive training, can allow it's wielder to be much more effective in it's use. Mastery Bonus: A mastery bonus allows a character with weapon focus (shamshir) to gain a unique benefit while wielding a masterwork shamshir. This benefit is based on the bonus granted to you by the weapon focus (shamshir) feat: