Astral Plane

The Astral Plane, also known as the spirit world, is an ​alternate plane of existence that is inhabited by all spirits and entities such as demons and deities in their natural incorporeal state.

Overview
The Astral Plane exists within and beyond the physical plane, mirroring it completely with the same surroundings and inhabitants. Within the Astral Plane, all matter is composed of ectoplasm, a substance that is usually invisible and intangible to the physical plane and the things in it, excluding certain supernatural beings capable of seeing past the Veil, a magical barrier that separates the spiritual planes of existence from the physical world.

On the astral plane, the spirits of other beings are discernible to adepts, such as powerful psychics and witches. While spirits within the Astral Plane are able to perceive and interact with each-other, they remain are unable to feel or be felt by corporeal beings.

Access
There are several means of either seeing past the Veil to perceive the entities within the Astral Plane, and even of actually entering and becoming a denizen of the Astral Plane. Deities and demons  can naturally see past the Veil, allowing them to easily recognise other supernatural beings. Humans can enter the Astral Plane through several methods, most of which apparently involve them temporarily leaving their physical bodies and existing within the Astral Plane, via astral projection or near-death experiences.