This build is for pure attack, and tower/base destroy.

The items are relative, if you need more drain, make vampiric before, if you need attack and movement speed, phantom... etc. You will enter enemy base and make a solo destroy.
Enjoy it.

I had a problet at putting runes, but well put runes with:
Attack speed, damage, critical, and critical damage.

The first should be W, cause it increases attack speed as passive, and the double at active. I put E after cause its range, but if ur fighting a melee, start with W and follow with Q.

Attack speed its the most important (and damage) so always try to buy daggers (first doran's shield, then dagger to later make berserker boots... another dagger for zeal... then damage)
and you will be inmortal after phantom.

Cure its important because you go attacking champions and towers, so a good heal can be the cause that makes you win.
Teleport its important because you can be destroying a tower or base, go back to restore heal and buy items, and come back fast, perfect for Xin.

Xin is a good farmer. If you increase your W skill at max, you will be so fast, and with more damage, you kill minions so fast, so you get lot of gold. Buying the items i put here, you get a nice fight power.