Ether
Ether is a precious resource that is extracted from the Hollows, and powers the city of New Eridu. Ether is exclusive to the Hollows and New Eridu.
New Eridu is known as the last 'oasis' due to the technology allowing the city to coexist with the Hollows. The 'magic' behind the city's prosperity is the Ether resource, for which various factions have their eyes set on.
Extraction
The founders of New Eridu developed technology to extract Ether from the Hollows. The city's prosperity relies on this precious resource.
Several factions are interested in obtaining Ether.
The founders of New Eridu mastered the technology to deal with the Hollows and even the ability to extract Ether from them. The entire city's prosperity relies on this precious resource, a magic exclusive to New Eridu!
Creation of Companion Hollows
High Ether activity in a Hollow can create a Companion Hollow. Companion Hollows are Hollows that are created by the Ether activity of another Hollow.
A Companion Hollow of the Lemnian Hollow was created due to high levels of Ether activity.
Discussion of the Lemnian Hollow in Ridu's Newsletter Vol 3