The "blue-ish" Ashe
Not Updated For Current Season
The masteries shown here are not yet updated for the current season, the guide author needs to set up the new masteries. As such, they will be different than the masteries you see in-game.
A few Words
First and foremost: This is in progress, pretty much more like a scaffold about how I think Ashe is probably built best in Season 6.
So, why Essence Reaver? I think, with the changes to Ashe's ability to Crit (She doesnt do additional damage with crits, rather only doin improved slow), I really think that the Infinityy Edge is inferior to other Damage Items on her, cause the passive doesnt do anything.
The question is: when do you wanna crit? The most important crits are those when you wanna kite. Since you'll have either your Q running or your W available, chances are you will crit and thereby apply that improved slow pretty much permanenty even with lower crit chance values of like 50%.
Given all that: Ashe was always an ADC that highly profited from AD, even over Attack Speed, because of her W (some may remember the Blue Ashe build of Genja back at the end of season 3). Essence REaver really compliments on that: Massive Cooldown Reduction and mana sustain, so you can just spam your W in team fights, doin tons of AoE Damage. Also, the reduced CD on your Ult is wonderful.