This is my first build so it might be sloppy but I've had crit's over 1400 every 3 sec with Parrrley . IN THIS BUILD WE AVOID ATTACK SPEED ITEMS

26-0-4
there are so many things in this tree that help gangplank, arcane knowledge (10% magic pen) helps with gangplanks ult .

rush to get cloak of agility in begging of game it starts your way towards beast mode


Alternate Items,
a good defensive item (if you need it) is the soul shroud , it gives CDR with lowers his Parrrley even more. Replace Executioner's Calling with this item.

Raise Moral before goin in and Parrrley as much as possible ,
its a great harrass skill,
remove scurvy to cleanse or if u need health.
save ur ult for when people escape from the team with little health
or to slow them when everyones running away.
try to rely on life steal to heal yourself, to save remove scurvy for when u need it.

Flash
ghost

other good ones

teleport
ignite
exhaust

why?
Flash- great for sneaking a gank or flash away from a fight you cant handle,
Ghost- since we dont get boots right away ghost helps chase people down or helps you run away

Teleport- i always get teleport in 5v5, it helps u not lose exp when goin back to buy items or when u die. u can also teleport to towers in danger and avoid losing some towers

Ignite- stacks with gangplanks passive and can easily net u a few kills

exhaust- helps get kills and avoid being killed

last hit as much as possible with parrrley. The extra gold you get is rediculous if used right and helps u buy certain items faster

pros-
huge crits
low CD with parrrley
not very squishy compared to others
life steal works with parrrley and crits

Cons-
rely on Parrrley
rely on crits
without summoner spells not very easy to escape

First build ive ever made so bear in mind. i love this build tho. the crits are crazy and the remove scurvy is extremly useful. all and all you can have major fun with this build and youll win most of your games. have fun