Astral Plane

Astral Planes refer to an alternative representation of a reality, much like alternate dimensions or parallel universes, though for the use of the game lore, it's also closely related to branes, which are the way the theory of strings refers to membranes made of strings or particles elongated towards a specific dimension. In this case, meaning an object when seen from a different position from other dimension than the three spatial dimensions or the time dimension. It's often related to the fifth dimension.

Astral planes are always relative to an object, and are meant to be what the object looks when travelling through the fifth dimension. It's known to be almost impossible to travel between astral planes due to branes being hard to penetrate by mass objects, the only way known being macroscopic quantum tunneling, which involves making a hole in the fabric of dimensions in order to create a tunnel between one or more branes.