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1vs1 against Darius:
1) Use a potion - So you can decrease his passive damage.
2) Take advantage of your skills - Darius just have two damaging skills (Q and W), and his Q do less damage if you are close to him. Irelia's W and E are good option.
3) Take advantage of your attack damage - Irelia's attack damage is higher on early game and her attack speed is higher all game long (not considering the build).
Same thing. When he try to use his ult, flash. So it will probably enter on a cooldown (nobody never tried it on me).