Exquisite Essence

Exquisite Essence was a low-level crafting material in Diablo III, obtained by making the Blacksmith salvage magic weapons and armor. Each item with an item level of 1-60 salvaged would yield between 1 and 4 Exquisite Essences. They could be stacked up to a maximum of 5000. Exquisite Essence, along with Iridescent Tear and Fiery Brimstone, were the only crafting materials that were not account bound.

As of patch 2.3, they are no longer obtainable.

"Artisans through the ages have relied on magic materials to enhance and create powerful items."