Essence Reaver's description doesn't make sense
>UNIQUE: +10% Cooldown Reduction. UNIQUE: Gain up to +20% additional Cooldown Reduction equal to your Critical Strike Chance from other sources.
Essense Reaver gives you 20% CDR when you buy it, but it says it gives you 10%. Given the item's description there's no reason I would believe the item would give me 20% CDR as soon as I bought it. It would make more sense to remove both passives and give it the description:
>UNIQUE: Gain up to +40% Cooldown Reduction equal to your Critical Strike Chance.