Aetherium

🔈 (ay-THAIR-ee-um)
A Drankorian cosmological treatise, written during the Drankorian Era

The Aetherium is a famous Drankorian treatise on the Ethereal Plane. It is the basis for the dominant school of thought that identifies the Ethereal Plane as an echo or extension of the Plane of Magic, becoming more transparent and dilute near the borders of other planes.