Teamfight sustain and dueling power.
Improved attacks and sustained damage
1.5s after damaging a champion gain a large amount of attack speed. Lethal Tempo allows you to temporarily exceed the attack speed limit.
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.
9% attack speed, 10 ability power or 6 attack damage
While above 70% health, gain up to +40 Ability Power or +28 Attack Damage (based on level), Adaptive.
Gain increasing amounts of AD or AP, Adaptive over the course of the game.
Lethal Tempo's additional Attack Speed is massive for empowering you to get your feathers out quickly and get as many auto-attacks off as possible during your [W].
Overheal paired with Fleet Footwork is great for absorbing and sustaining lane poke from mage supports. The extra health shield keeps you ready for a fight at any moment.
The bonus Attack Speed allows you to get more feathers out in a a close all-in kiting fight so that you're able to secure the kill.
Coup De Grace is an all-around reliable source of damage when looking trying to kill squishy targets with [E].
Absolute Focus synergizes well with your lifesteal and sustain of Overheal and Fleet Footwork, keeping you above the threshold for extra AD.
Gathering Storm, like on most Marksmen, empowers you to become a late-game powerhouse able to take over teamfights entirely on your own with 4 items.