Xin Zhao should leverage his strong early-to-mid game ganks and excellent dueling power to quickly dominate the game.
A Conqueror bruiser build is stable, but a Hail of Blades Lethality/Crit build can also assassinate carries.
Compensate for his slower jungle clear by securing successful ganks, and in teamfights, focus on protecting allies or assassinating key damage dealers.
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