Essence Thief is a medium armor set. When you deal damage with a Light Attack, you have a 15% chance to draw essence from an enemy. Collecting the essence heals you for 4300 Health, restores Stamina, and increases your damage done by 12% for 10 seconds.
The Essence Thief set is part of the Imperial City DLC. It drops in White-Gold Tower in the Imperial City. Each set item is bound on pickup. You can acquire medium armor, weapons and jewelry of this set in the Xivkyn motif style.