Recommended Build

Playing as Ahri

Tips to maximize your impact

Charm first, combo second
Land Charm (E) before your combo: it's your only CC, and a target walking toward you takes Orb of Deception (Q) both ways.
Bring your orb back through the target
Position so Orb of Deception (Q) hits on the way out and on the way back: the return deals true damage.
Farm to heal
To stay in lane, clear the wave with Orb of Deception (Q): Essence Theft (passive) heals you every 9 minions or monsters killed, and more after a takedown.
Save a dash to get out
Engage with Spirit Rush (R) but save a dash to get out: you can cast it up to 3 times, and each takedown gives you another.
Push, then roam
Push your wave with Orb of Deception (Q), then roam: the dashes of Spirit Rush (R) get you there fast and back out just as fast.

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Global strengths and weaknesses

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Build, runes and tips against each opponent

How to counter and exploit weaknesses

Stay behind your minions
Keep minions between you and her: Charm (E) stops on the first enemy hit, and without it her burst lands far less often.
Dodge the return of her orb
If you can only dodge one pass of Orb of Deception (Q), dodge the return: it deals true damage, which your resistances don't reduce.
Play hard when her R is down
Play hard once she has used the dashes of Spirit Rush (R): she has nothing left to escape with, and its cooldown is 140 to 100 seconds.
Group up when she roams
When she roams, avoid walking through the jungle alone: Charm (E) then Spirit Rush (R) let her catch an isolated target by surprise.