Ether


 * What is a god? What is ether? A concept that has gained an identity. A law with will. Something that could not exist; something that should not exist.

are the materialized concepts; these are the forms of concepts that have acquired will, awareness, self-identity, and godly existence, through humans' beliefs and perceptions of gods. The manifestation of Ether depends on the desires, hopes, dreams, and imaginations of humans. Subsequently, Ether born into physical reality through the Spirit Circuits.

Appearance
Ether exists in two distinct forms: physical ether and metaphysical ether. Physical ether takes on various forms based on how humans define it. For example, Holou's physical ether manifested as a quill pen and an ink bottle, while Ocain's took the shape of the great forge of Hardenfell. Additionally, physical ether can generate its own puppet or avatar. On the other hand, metaphysical ether represents the true essence of the Old Deus. According to Einzig, it exists in a higher dimension, while Holou claims that her Ether exists in $13 + i\mathbb{R}$ variable dimensions. It is essential to note that physical ether can be perceived by humans because it exists physically, but metaphysical ether is beyond human perception and understanding, existing only as a metaphysical concept or idea.

Trivia

 * Ether explicitly has a similarity characteristic to Plato's "Form" in the Theory of Forms. According to Plato, the world of Forms or Ideas represents the ultimate reality, while the physical world is merely a reflection or imitation of the world of Forms. This implies that the concept/form remains unaffected even if its physical representation is destroyed or erased. Similarly, Ether exists in both physical and metaphysical forms. The physical ether is an incarnation of the concept in the physical world, while the metaphysical ether represents Old Deus' true core, existing in a higher dimension beyond human perception. The destruction of the physical ether does not impact the metaphysical ether, allowing Old Deus to continuously manifest the physical ether at will. This perpetual resurrection of their physical ether is the reason for the ongoing Great War.
 * In Light Novel Volume 10, False ether or essence refers to the inactive ether that has been reactivated and manipulated using Spirit Arms
 * Suniaster is an ether without ego. It is a physical manifestation of the concept of omnipotence, omniscience, and absolute dominion.