This is the first time I make a build here, so it might not look as formidable as all the other builds and topics.
This is just a reflection on how I play(ed) Xin in draftmode as a jungler with some damage and off tank abilities.

I use flat armor penetration marks and quints, attackspeed seals and flat magic resist glyphs for early ganks. I believe it gives me an advantage in early ganking when between levels 2-5 and possibly snowballin throughout the match. This way (when succesfull) you can and will make the difference in teamfights.

I start jungling with Cloth Armor and only 2 potions. When you jungle properly, this will suffice, since normal junglers are selfreliant from level 4. In this way, you save 100 gold, so you can aquire madreds faster, which will help you to get boots faster. This way you have some xtra damage and speed, which are essential to early ganks.
I think the rest is quite obvious,Wriggles for the dmg, lifesteal and wards(which are essential to help out the team), Berserkers greaves for the +25% attackspeed, as the black cleaver; dmg, speed and armor penetration.
Warmog's for the endurance + the xtra health from the monster/minions you kill. When farmed propely, you can have health well in 3000.
Wit's end for the attackspeed-speed and magic resist.
Atma's impaler, for armor, dmg and crits.
Finally, when you get there, Phantomdancer to top it off, giving xtra speed, movementspeed and crits. Sell the lantarn to make room for it.

I hope this works out for you as it did and does for me.
I can handle critics, but please explain why you like or dislike an item in this build.

Sincerely,

EvilglYce