Innate:Fiora identifies the Vitals of nearby enemy champions, marked as an arc around their character. Vitals take 0.5 seconds to identify and last for 15 seconds. After a Vital is triggered or times out, Fiora identifies a new Vital on her target.
Basic attacks and damaging abilities against a Vital deal 2% (+ 4.5% per 100 bonus AD) of target's maximum health as bonus true damage, healFiora for 25 - 110 (based on level) and grant her 20 / 30 / 40 / 50% bonus movement speed that decays over 1.75 seconds.
The first enemy champion struck also has their movement and attack speedslowed by 50% for 1.5 seconds. If Fiora parries at least one immobilizing effect, Ripostestuns the target for the same duration instead.
The Victory Zone's duration increases by 1 per Vital hit, up to a maximum of 5 seconds. While Grand Challenge is in effect, Duelist's Dance does not identify new Vitals on her target.
Grand Challenge is an enemy targeted ability with an enemy debuff and area of effect component.
Equal as Duelist's Dance it tooks 0,5 seconds identify all the Vitals, it means that you have to wait at least 0,5 seconds until hit the target to proc the victory zone. If the target dies before Vitals get indentify at all, it will not proc the victory zone.
Grand Challenge does not end if Fiora dies. If Fiora gets at least a hit on the Vitals before dying, and then her target dies, the victory zone will still activate.
The target is considered dead for the purpose of Grand Challenge and the victory zone will activate if they enter a pseudo-death state - Guardian Angel, Chronoshift.