User blog comment:Supp0rt4n00bz/Broken Xin is broken!/@comment-4834593-20130728161859

As someone who made a 1v3 triple with Xin yesterday (while having the grand amount of FIVE kills before that fight at  ~28 minutes), I agree he's quite broken.

I don't believe, though, that he can really be balanced just by changing numbers. As you said, his kit synergizes like crazy, and I think he needs a total rework to make it synergize a bit less.

If you'd try with just numbers though, I'd say decreasing the passive to 10%, reducing the ult armor and magic resistance to 12/16/20 per champion (max: 60/80/100 instead of 75/100/125), and probably changing Q base damage to 5/20/35/50/65 to reduce his early game triple Q burst.