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Stay a support until late game, you are squishy and don't do enough damage, I recommend jungleing and killing creep until then
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Sparrow is vary under rated. She is a vary strong push (late game lvl 10 and above). Focus on crit and speed attack builds. In early game stay close to the tower and just drink up the XP (and rank up as fast as you can)... avoid feeding the other team. Because she has no escape or heath. Good luck!
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For a general build, get a windcarver's blade(or similar) and a HP,Mana or a HP, Attack Damage.