I know Rito has plans for ER changes in preseason so I thought I should suggest this(I'm too lazy to do the maths now). Essence Reaver gives sustain but it's not worthy of that cost which usually gives a serious power spike. Actually it's a pretty bad item as it is now, for its mana refund scales with the damage you deal, which makes it useless as an early game item(and I think that's exactly what it should be).
Feel free to post your opinion on this.
What essence Reaver really needs is an active that restores x amount of mana and a build path that has a similar small version of that.
Yea the only prob with ER is the 
, no top laner can afford to rush that.
+ + = 
What it needs is a better identity. If youre gonna buy that for Mana and CD over BT for better lifesteal and shield, give it more of that.
Make it that ever AA ER does reduce all non-ult spells decrease by .25-3s each. So it becomes a better niche pick for AD mana casters like Ezreal corki lucian. Ezreal is already relatively safe doesnt need BT, I rather have this passive plus his Q so he can spam E and W more often.
This would make it possible for AD casters to reach 40% cdr either by getting this + mastery + lucidy boots or Black cleaver
