Spirit Dimension

The Spirit Dimension is an inaccessible (to the living) dimension where the deceased go if they have unfinished business. It is the 'heaven' to all the Multiverse, although less than 15% of the Multiverse's population manage to go here.

Location
The Spirit Dimenson is located in the fifth dimension, so high upwards that it's existence is not known to the living. Not even the deceased fully understand it.

Spirits
Each spirit gets a home of their choose, despite not needing one. They get a window into the world of the living that they can go through at time. Some individuals are visible but some are not, like Milly Bear. Spirits can only be in the living world for an hour. If they are still there in an hour, they will fade from existence.