Massive damage and teamfight presence.
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.
Empowered abilities and resource manipulation
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 on Ashe allows you an early proc with [W] and tons of follow-up auto damage with the massive boost of Attack Speed when paired with [Q].
Overheal is an all-around great rune choices on most AD Carries. The shield while small, negates a lot of damage over the course of the game.
Legend: Alacrity is the go-to on pretty much every AD Carry, especially Ashe who loves to auto as much as possible.
Coup De Grace pairs so well with Press the Attack's bonus damage and is more reliable than Last Stand when you have healing.
As a backline carry, in teamfights the additional Attack Damage from Absolute Focus will empower your ability for your rapid auto attacks to deal a ton of damage.
Gathering Storm further empowers your marksman late-game scaling to take over teamfights.