Netherworld of the Force

According to the religion of the Kages, The Netherworld of the Force was an ethereal realm of the Force that Force-Sensitives went when they died. There were two sects of the Netherworld, Kaos and Serenity. Dark side users, such as Sith went to Kaos when they died where they were tormented in purgatory for using the dark side. Light Side users like the Jedi went to Serenity when they died, a place of eternal peace and happiness. It was ruled by a Bright Overlord, a manifestation of the Light Side itself. Those who went to Serenity were able to come back to the physical realm and interact with the living.

Some Jedi who used the dark side to hunt Sith and other dark side users were sent to Kaos where they became known as The Countless, an army of spirits that tormented the spirits of the dead that were sent to Kaos. They were commanded by a Dark Underlord, the ruler of the realm.

Those who found balance in the Force, such as the Djedah, were able to freely travel between the two worlds, as well as the physical realm. Those who were not force-sensitive were absorbed into the living Force and their spirit's wondered the galaxy.

The Jedi would adopt the idea of a Netherworld into their own religion several thousand years after the Kage's establishment of the idea.

Appearances

 * Bright Shadow (first mentioned)