Astral plane
From Marillia
The astral plane (or capitalized), also known as the Astral Sea, the astral world, the astral realm, the astral universe, and the Sea of Stars, is a plane of existence variously postulated as a middle realm between life and death, the world where the mind goes when it is asleep, or the world of the afterlife itself.
The astral plane holds great significance in theology, cosmology, and metaphysics. In the World Axis model of the cosmos, the astral plane is considered the birthplace of the gods. In the Great Wheel, it is considered a pathway connecting the material world to the metaphysical world.