Aetherius

Aetherius (アエサリアス Aesariasu) is a dimension created by Bellerophon to serve as his secret base of operations.

Summary
Aetherius was created by Bellerophon after intensive study of the Sacred Gear Dimension Lost.

Unlike other dimensions, which can be accessed through the Dimensional Gap or by using magic circle-based Teleportation, Aetherius can only be entered through a special portal Bellerophon created on the far side of the Moon.

Appearance
Aetherius appears as a Micro Dyson Sphere with a diameter inferior to a thousand kilometers, with no true "outside".

The land has a habitable and terraformed surface with a similar composition to Earth's crust and the same land-ocean ratio as Earth.

At the center of the dimension lies a "Magic Star" that provides terrestrial lighting as well as energy for the entire system in Bellerophon's absence.