Full crit damage rune Jhin
Full crit damage runes for a total of 45.5% increased crit damage.
, 1st item
Full build:
+ boots, ga, merc scim, or whatever
Laning phase is 100% about cheesing the 4th aa crit mechanic. All you do is stay back, set up defensive zones with your traps, and peg the enemy adc with your 4th aa's. Over and over. Although rushing infinity edge would certainly do tons more damage than the firecannon, the added range for your 4th aa is invaluable.
As the game progresses, you will eventually be critting for 295.5% damage on your ult and 4 shot. Otherwise, you will be critting for 221%. At level 18 with full build and an elixir, you will have over 800 ad. That means your 4th hit crits will be 2400+ damage, and your ult will just erase people. Your standard crits (every other attack) will be for over 1800.
The best part is that with this strat, you can maintain maximum distance even with your aa's, preventing the enemy from easily engaging you so that you can take full advantage of your trap zoning and long range abilities.