Sustain and Attack Damage scaling.
Improved attacks and sustained damage
Attacking and moving builds energy stacks. At 100 stacks, your next attack heals you and grants increased MS.
Excess healing on you becomes a shield.
Takedowns on enemies grant permanent Attack Speed.
Deal 7% more damage to low health champions. Gain AD/AP after kills or assists.
Empowered abilities and resource manipulation
Hitting enemy champions with a spell grants maximum mana.
After reaching 250 mana, Manaflow Band restores 1% of your missing mana every 5 seconds.
Gain increasing amounts of AD or AP, Adaptive over the course of the game.
+6 AD or 10 AP
Jhin loves the healing from Fleet Footwork for sustain, but the movement speed to get into 4th shot range is the real kicker here.
Thanks to Fleet Footwork it's quite easy to gain a reliable shield to keep you healthy in small trades.
Attack Speed on Jhin acts as a great AD multiplier, combined with Absolute Focus and Gathering Storm
Jhin's 4th shot execution damage pattern screams for you to take Coup De Grace so you can quickly and painless execute your target.
Manaflow Band on Jhin is excellent for empowering your early game harass and waveclear with [Q].
With Jhin's passive acting as an Attack Damage modifier, you'll be hitting insane AD numbers in the late game.