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.
+9% Attack Speed
+5 AD or 9 AP
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 is a great general damage implication across the entirety of the enemy team.
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.