Recommended Build

Playing as Irelia

Tips to maximize your impact

Mark your target before you dash
Mark your targets with Flawless Duet (E) or Vanguard's Edge (R) before Bladesurge (Q): if the target is Unsteady or dies to it, its cooldown resets.
Stack your passive before trading
Before a trade, hit minions with Bladesurge (Q) to stack Ionian Fervor (passive): each stack gives attack speed, and at max stacks your autos hit harder.
Catch your target between blades
Place the two blades of Flawless Duet (E) on either side of your target: only enemies caught between them are stunned.
Tank burst with Defiant Dance
Use Defiant Dance (W) to absorb a burst: you take less damage while charging, and the longer you hold it, the harder the release hits.

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Global strengths and weaknesses

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How to counter and exploit weaknesses

Stay away from low-health minions
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.
Dodge the line of her blades
As soon as the first blade of Flawless Duet (E) lands, change direction: the stun only hits enemies caught between the two blades.
Trade before her passive stacks
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.
Wait out her Defiant Dance
Save your burst for after Defiant Dance (W): while charging, she takes much less damage, but she can't do anything else.
Dodge her blade ult
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.