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Xerath Build Guide by detailing
Xerath - Lux's Big Brother
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All you need to know is that your champion is based on skillshots and you will probably won't do as much kills as the Xerath who made you buy this champion. It takes time, it takes much more time then Garen, Xin or Soraka.
My advice: Don't give up on Xerath, give him a chance and play at least 20 games before you move on to another champion.