Not Updated For Current Season
The masteries shown here are not yet updated for the current season, the guide author needs to set up the new masteries. As such, they will be different than the masteries you see in-game.
For items i go back and Get the "Avarice Blade"(x2) as soon as i can. this will help your money intake extremely and the crit chance is also nice. this build if made for a late game play once you get your infinity edge (around lvl 13/14) you can start ganking very effectively phontom dancers really help with your dodge change and attack speed and with runs makes your crite chance over 100%... after i get "The Bloodthirster" i usually go back and sell my Avarice Blade and pick up "Executioner's calling" another thing to consider after your have maxed out your item list selling your boots is not a bad thing to do the to phantom Dancers are more then enough movement speed (with the extra slot i either get another phantom dancer .... this allows me to solo Barron if needed). also with the three phantom dancers you can sell your last Avarice Blade and get a "Madred's Bloodrazor" to help take out enemy tanks.
If this is your first time playing twitch remember never become visible next to an enemy champion you are probably the most squishy player in the game so just be aware of this and prepare to be the carry late game ... in order for this to occur you must not feed early game.
most people disagree with the clarity and get a exhaust, i prefer the Clarity because it enables you to not have to buy mana items Early game, and there have been several times were i was able to stay in a lane getting more experience. in my opinion flash is the only option for the second spell it has saved my life countless times and enables you to tower dive and come out alive.
my scores that i got with this build were
(we ended up winning all of these including the last which was 4v5)
This is my first build that i thought worth of sharing so plz feel free to comment and offer ideas.