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.
so... short and sweet, this gives you a bit over 100% crit chance.. so if the game breaks... you can still crit.
sheen procs with parrley, which is where a lot of your damage will come from.
the thirster is a must have for late game cuz despite remove scurvy pirate dies way too fast, soooo yah. if your having trouble with tanks either a black cleaver (preferred) or last whisper can be substituted in place of a dancer, thus sacrificing some crit, but, eh.
you need to play defensively until you get a few instances of scurvy, and then you can be a lil braver.
do not use parrrley for harassing... if you cant tell, its a very expensive build and you need all the bonus gold from parrrley you can get. so use parrrley for last hitting only (exceptions. TWITCH ashe teemo other really squishy champs or champs low enough on health that parrrley will make them want to recall
you will be fairly mana hungry early on, which is why i pull clarity, yes, its fairly useless later, but you can use it to help your caster teammates.
IF BY SOME CHANCE THERE IS A TWISTED FATE ON YOUR TEAM: get raise moral at level 2 instead of remove scurvy... twisted fate's passive gives you 2 gold when you kill allied minions too.
in the build list... if there is an item that doesnt' have "ingredient" items in front of it, that is because your buying it out of pocket. this is so that you can let your avarice blades do half the work for you. for your last 3 items, you will sell your avarice blades and your shoes, thus resulting final build to appear as