This build is meant to be able to fight well during a intense team battle, or just to dominate a solo fight... in team battles the splash damage drops everyone's health while you only focus one player. i recently solo'd a 3 people and left the fight with half health... (Darius, zyra, and riven). the amount of life gained while fighting is pretty close to the same amount from 2 blood thirsters alone. so there isn't much need to another one. this is a pritty expensive buld but while you're playing xin... price isnt a problem :) you all know that. but still i normally go one by one so i know what im going for,, but you can combine the items and make them cheaper down the road.

well so far i have completed the build 4 times and every time i have it finished, the only character that was even remotely close to a challenge was fiora and that is because her ult makes her untargetable. the last game i played with her i auto attacked someone while hiding in a bush (i was typing at the time "because there were trash talkers") and i killed a tanky riven in 5 basic attacks :) soo that jus obviously says that you'll do alot of damage per hit.
so far i have found no difficulties agianst any other champion but fiora was that bad.

i use the Heal spell because at start everyone could use a little extra health or fi youre trying to gank and little low on healh... but the best part is, is when the other tram is getting gitty and thinks they can kill you, and you just pop heal and theres a free kill :).

I use the Teleport spell, so that i cank quickly gank other lanes and get eaiser feeds when a side is having issues. normally i get doubles but sometimes it just end up a single kil becuase flash... but have youre team buy sight wards and you'l become a ganker :)

you'll be a vital part of your team survival in a team fight because of how much damage you do per hit.. not just to one person but to every single champion in the vicinity. you can single out a target but by the time ur team gets to that champion, you would already have the kill.

hiding in the bushs is a great way for a quick kill... youre damage will nuke their health and you're dash is almost immediatly cooled down after the initiating attack.
jungling is fairly simple just go like u normally would.. get blue and gank like no other :).
keep teleport so that you can get a quik escape or very fast ganks form lane to lane.

these runes are all based around penetrating their armor and high crit dmg. increasing the crit allows even more dmg done to each opponent.

im sorry, but the masteries are pritty much basic.. their not required to have like this but, i would reccomend it.

every item is very important to get in sequence, because if you dont, you will either lack attack speed or attack damage... and xin dont need to be lacking either one, i mean yeah its true, you can run the entire game with a single dorans blade and kill almost anybody, buuutttt that would take to long.