Fiora vs Irelia

Position to hit the Duelist's Dance (passive) Vital: each Vital you hit heals you and gives you move speed.

Cast Lunge (Q) on the Vital's side: the strike prioritizes Vitals, and hitting an enemy lowers its cooldown.

Save Riposte (W) for enemy CC: it parries damage and effects for a moment, and if it parries an immobilizing effect, your stab stuns the first champion hit.

Hit the four Grand Challenge (R) Vitals by circling your target: if you hit them all in time, or they die after the first, you heal nearby allies.

Don't stand near your low-health minions: Bladesurge (Q) resets when it kills, so she chains dashes from minion to minion until she reaches you.

As soon as the first blade of Flawless Duet (E) lands, change direction: the stun only hits enemies caught between the two blades.

Take your trades when Ionian Fervor (passive) isn't stacked: she builds stacks with her abilities, and at max stacks her autos deal more damage.

Save your burst for after Defiant Dance (W): while charging, she takes much less damage, but she can't do anything else.

Dodge Vanguard's Edge (R): its blades make you Unsteady, which resets Bladesurge (Q) on you, and the cage they form damages and slows anyone who crosses it.