Focus - Ashe's critical strike chance increases by 3 / 6 / 9 / 12 / 15 / 18% every 3 seconds while not attacking. Focus' bonus is expended with her next basic attack.
I'd like to hear your opinion of this passive, I personally believe it's pretty much useless if not the worst passive in game, especially in mid-late game after buying a dancer. In early laning phase it's great for 1st hit when you almost get half of your's enemy hp with just one shot but what after it and if he's smart, he'll wait in bush for you to waste it on minion. You wont wait next 30 seconds to critical again cause you have to keep cs-ing. 3% is a small percent but if it was higher it would be overpowered. After you crit. him 1st time you can say goodbye to your passive until you come back to lane again. What do you guys think about it, I personally believe they should give her passive armor penetration or something like that.