A non-spatial membrane of reality immediately beyond the material. The realm of spirits and thoughtforms.
Free spirits who dwell here exclusively are known as Moksha. Samsari are symbiotically bound to material creatures, but exist primarily here.
In the event of twin dimensions within the same Mokshaic membrane, a Samsaric Portal is a possible avenue of travel between the two, bypassing much of the usual challenge of interdimensional travel.