Obsidian Essence Crystal

is one of the six essences that players can collect in the world of TERA. It is used in Processing and Alchemy.

is found by harnessing a Node. Harnessing a node will give players between 3-5. Players also have a chance of receiving 1-4 Achromic Essence.

Pulsating Essence can also be acquired by chance when mining a Node.

Source
This essence can only be found in areas aimed at players level 58-60. These areas are:
 * Val Tirkai
 * Helkan District
 * Val Kaeli