User blog comment:Willbachbakal/(Champion Rework) Fiora, the Grand Duelist/@comment-16210885-20131101094732/@comment-1330314-20131101201152

The damage is meant to stack as well, so with full stacks you'd deal 4% of the enemy's maximum health upon each physical damage application. Keep in mind that I also heavily nerfed Fiora's base attack damage, removed her passive AD and took out her double, instead making both conditional upon successfuly parrying with.

The reason I wanted to move her damage to an on-hit effect was so that she'd have some innate synergy with her ultimate already, and so that Fiora doesn't fall off as hard if she doesn't snowball immediately and buy a. The other advantage to this is that is allows her passive to remain relevant all the way through to the late game, and while it starts off actually quite weak ('s passive is far stronger at the start of a fight) it builds up in strength the longer Fiora remains in battle.