Frozen Mallet Ghost and Cleanse. I run atkspd reds and quints for the lolz just cuz I don't have problems in lane last hitting. Anyway would getting BotRK be better then FM. The active and dmg and cost r nice but FM is gurantee no escape.
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Xin has a ton of innate damage, and can afford to really offset damage for his bruiser build.
Mallet synergizes well with him. After than and maybe another Giant's Belt, get a Brut. Finish Giant's Belt into Sunfire or Warmogs. Get an MR item like Hexdrinker. Finish Black Cleaver. If game isn't over by then, then you can generally get whatever. BotRK at that point? Sure why not. Bloodthirster instead? Just as effective. More defensive stuff? Always great.