The final attack damage on this is not showing correctly because the core has only 4 items in it and i left 2 slots to choose from the items below it. This means it has a lot of hidden potential depending on which items you use. I get 290 to 360 damage depending on the 2 items. Besides with 40% + 54 flat penetration it would far surpass the burst of that 445 build.

I don't like one thing on this build: the final attack damage. I've seen some builds on the final attack was like 445, if this build want to be a assassin build, you can make some changes about this item. Look at this build for example: http://www.mobafire.com/league-of-legends/build/xin-zhao-ranked-bot-jungle-solo-top-updatig-7-19-2012-168555, I think you can make some improvements.

Well anything that works for you guys. I prefer to have lower cooldown summoner spell and items than more hp and regen so :/

*cough cough* Runic Affinity *cough cough*
Well jungling anyways, non jungling, thats a maybe depending on who needs blue buff the most

Yeah, I was going to say. 9 points in utility doesn't add anything for an assassin-type Xin Zhao. The defense masteries would be much more beneficial.

In which case 21/9/0 is better.

@ laggermeiser:
this is a full offensive guide, with item cooldown reduction. I dont know if it works, but in theory it sounds great!

I don't agree with 21/0/9 masteries.

This is how a guide should be. :)
Not just info that we know, but something new in masteries and items.
I agree with ognoglavi: Good job mate!

Thank you very much.

I've just upvoted your guide cause I really, really like it! It's short, but gives fine explanation on what, when and how... Good job friend!