Ethereal Bones

Ethereal Bones is an ingredient. It is used in Alchemy for the creation of Greater Mana Potion.

Source
Ethereal Bones is a loot drop and can be obtained from:
 * Das Vul
 * Das Lux
 * Darken Nox
 * Gazer
 * Lich Lord
 * Dark Lord
 * Vox Oras
 * Vox Maros
 * Crypt Dragon