The Aspect of Potent Blood is a Resource Aspect. It can be imprinted on Rings. It can only be used by Necromancers.
Effect
Blood Orbs grant [10 - 30] Essence.
How to get Aspect of Potent Blood
The Aspect of Potent Blood can be unlocked in your Codex from
Betrayer's Row
The fastest way to get the Aspect of Potent Blood is to gamble Rings on a Necromancer.
The best way to get Aspects is to gamble your
Murmuring Obols