Lane harass and utility damage.
Empowered abilities and resource manipulation
Hitting a champion with spells hurls a comet that deals adaptive damage at them. Landing more spells reduces Arcane Comet's cooldown.
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 3% extra MS. Gain extra AP or AD, based on your bonus MS, Adaptive.
Gain increasing amounts of AD or AP, Adaptive over the course of the game.
9% attack speed, 10 ability power or 6 attack damage
Takedowns restore health and grant bonus gold.
Deal more damage to champion with more maximum health than you.
Arcane Comet is a solid offensive rune choice for Jhin thanks to its high Bonus AD scaling. If procced when using [W] for a root or [R], it's almost guaranteed to hit.
Manaflow Band provides you the mana sustain so you can start Doran's Blade instead of the typical Doran's Ring.
As an alternative, you can also start Doran's ring and talk The Ultimate Hat here instead.
Jhin is one of the fastest moving AD Carries in the game thanks to his passive, Zeal stacking, and tendency to build Ghostblade allowing you to position better for your 4th shot.
The Movement Speed from Ghostblade and Zeal items act as a small AD steroid thanks to Celerity.
Gathering Storm makes Jhin a late game monster with this naturally high Attack Damage and Attack Damage scaling on his passive.
As a long range utility AD Carry, Jhin is often licking up a number of assists throughout the game and the extra bit of gold and healing can go a long way in snowballing a lead.
Cut Down is an AD Carry's most reliable form of damage mitigation, especially when dealing damage to the enemy top, jungle, or mid who often build at least 1 health item.