Dimensions

Spirit World
The Spirit world is a natural plane of existence where spirits exist. It exists on top of the physical world and in tandem with it. They are the same place but in different planes of existence. While those in the spirit world can see people in the physical world, it is not the same the other way around.

The residents of the Spirit World, Spirits, are entities with origins unknown to humanity. Religions try to explain the natural, ethereal beings in vain. Spirits often try leave their realm to cause chaos in the Physical world, but they cannot do so without help.

According to Kenlow, the Souls of deceased Aera rest dormant in the Spirit World with sentience intact. While Human Souls move onto the Underworld, the Aera's go here so that they never truly die.

Physical World - Yatan
Yatan is the physical world where most life resides. The mana in the air of Yatan leaks out from the Spirit world which creates teal skies and magical phenomena.

Underworld
The Underworld is a dimension where souls naturally wander after its life in the Physical World ends. These souls are mindless and retain no active memory of their past life. Spirits love to feed on the wandering souls.

The Daera - corrupted Aera - are imprisoned in the Underworld. They are unable to escape and become twisted into Demonic creatures by the Underworld's magic.

Shadow World - Abaddon
Unlike the other three dimensions, the Shadow world is unnatural. Izanagi created it to be a catalyst for his power before he became the first Daera. It's imperfect creation led to its laws of nature being inconsistent and illogical. The Shadow World is impossible to travel to and its only purpose now is as another prison the Aera send the worst beings in existence, including Izanagi himself.