Chained Essence of Eranikus

The Chained Essence of Eranikus can release a poison that will damage an enemy for 45 seconds. This is a great item for preventing a rogue from stealthing with Vanish.

Source
This item was a quest reward from the quest The Essence of Eranikus which starts with the Essence of Eranikus which drops off the Shade of Eranikus in Sunken Temple.

As a quest objective

 * The Essence of Eranikus (2)