Guide to properly balance Fiora. (TL;DR at bottom)

CURRENT STATE

Passive: Fiora identifies the Vitals of nearby enemy champions, marked as an arc around themselves. Vitals take 0.5 seconds to identify and linger for 15 seconds. After a Vital is triggered or times out, Fiora identifies a new one on her target. Basic attacks and/or damaging abilities against a Vital deal 2% (+ 4.5% per 100 bonus AD) of target's maximum health as bonus true damage, heal Fiora for 30 - 115 (based on level) and grant her 20 / 30 / 40 / 50% bonus movement speed that decays over 1.75 seconds.

Lunge (Q): Fiora lunges in a direction and stabs a nearby enemy, dealing 65/75/85/95/105 (+60% bonus Attack Damage) physical damage and applying on-hit effects. This attack prioritizes Vitals and enemies it will kill.If this ability hits an enemy, 60% of its cooldown is refunded. CD = 16/14/12/10/8

Riposte (W): Fiora parries all incoming damage, debuffs, and disables for the next 0.75 seconds and then stabs in the target direction.The stab deals 90/130/170/210/250 (+100%AP) magic damage to the first enemy champion hit and slows their movement and attack speed by 50% for 1.5 seconds. If Fiora parries an immobilizing effect, Riposte stuns instead of slowing.

Bladework (E): Fiora's next two basic attacks within 4 seconds gain 175 range and 50% bonus attack speed. The first basic attack can never critically strike, but slows its target by 30% for 1 second, while the second basic attack is guaranteed to critically strike for bonus critical damage.

Grand Challenge (R): Fiora challenges the target enemy champion for 8 seconds, highlighting their four vitals and creating an area around them, granting Fiora Duelist's Dance's movement speed while inside it. While in effect, Duelist's Dance does not identify new Vitals on target. If she triggers at least one vital before her target dies, or triggers all four, she creates a Grand Challenge Victory Zone that heals all allied champions within it for 2 / 3 / 4 / 5 seconds.

[slayer-jinx-unamused]

THE WAY SHOULD BE!

Passive: Fiora identifies the Vitals of nearby enemy champions, marked as an arc around themselves. Vitals take 0.5 seconds to identify and linger for 5 seconds. After a Vital is triggered, Fiora identifies a new one on her target. If the vital times out, it goes on a 5 second cooldown before finding a new one. Basic attacks and/or damaging abilities against a Vital deal 2% (+ 4.5% per 100 bonus AD) of target's maximum health as bonus true damage, heal Fiora for 30 - 115 (based on level) and grant her 20 / 30 / 40 / 50% bonus movement speed that decays over 1.5 seconds.

Lunge (Q): Fiora lunges in a direction and stabs a nearby enemy, dealing physical damage and applying on-hit effects. Fiora lunges in a direction and stabs a nearby enemy, dealing 65/75/85/95/105 (+60% bonus Attack Damage) physical damage and applying on-hit effects. This attack prioritizes Vitals and enemies it will kill.If this ability hits a vital, 60% of its cooldown is refunded. CD = 10/9.5/9/8.5/8

Riposte (W): Fiora parries all incoming damage, debuffs, and disables for the next 0.5 seconds and then stabs in the target direction.The stab deals 90/130/170/210/250 (+100%AP) magic damage to the first enemy champion hit and slows their movement speed by 50% for 1.5 seconds. If Fiora parries an immobilizing effect, Riposte stuns instead of slowing.

Bladework (E): Fiora's next two basic attacks within 4 seconds gain 175 range and 50% bonus attack speed. Both attacks strike for total ad + 75% total ad.

Grand Challenge (R): Fiora challenges the target enemy champion for 4 seconds and adds 1 second for each vital hit, highlighting their four vitals and creating an area around them, granting Fiora Duelist's Dance's movement speed while inside it. While in effect, Duelist's Dance does not identify new Vitals on target. If she triggers at least one vital before her target dies, or triggers all four, she creates a Grand Challenge Victory Zone that heals all allied champions within it for 2 / 3 / 4 / 5 seconds.

[slayer-pantheon-thumbs]

TL;DR

Passive - Reveals vital for 5 seconds, refreshes instantly on hit, 5 second cooldown if timed out. Q - Only gets CDR bonus if it hits a vital. Reduced Cooldown W - Removed AS debuff. E - Between the 2 attacks, grants the damage you'd get from landing a single critical with . R - You get half the duration at start, with the rest of the duration upon hitting vitals.

[zombie-nunu-hearts]