Fiora Passive Change
What if she also ignores unit collision? its hard to hit those vitals if you are also trying to walk around minions and champions in a team fight. her dash range is so small so most of the time in lane you can only hit the vitals that are facing you so if you try to move around someone to hit vitals you lose potential dps if you had just been using autos. Even with your slow someone can just chose to fight you while you take the time to walk all the way around to their backside to hit hat other vital.
Or maybe some type of damage steroid when she hits a vital and her last attack also hit a vital to make up for the lost of dps you could have had if you just auto them