Shal'Gerat

"The Material of the Gods", also referred to as Shal'Gerat, is a mold to create buildings and other materials that should last eons. The material in it's rawest form is a black mud. Only when a being shapes the material to it's will, Shal'Gerat hardens and remains indestructible for normal beings. Records only speak of Gods, when it comes to destroying creations out of this material.

Known creations out of "indestructible materials" (most likely Shal'Gerat) are The Compendium of Nazra, Guardians and various buildings within the Ethereal and beyond the known Universe.