I guess they figured they didn't want to see some elementalist/assasin newb try to pull of some weird combo with shiro's weaponry. Can you really blame them? Now all people who use Shiro's stuff (who was supposedly one of the best assasins), have to be assasins themselves as a primary profession. I don't think there's much room here for an argument.
If they set it to 13, even down from 15, I'm sure it's higher than 12 for a reason. If you can guess that reason, you get a cookie.
H

(Making "cool", but still effective, builds has become a pass-time for me in GW.)
