The Beyond is a void where Humans go the moment they die. It is a layover area before they enter their afterlife. Humans emerge from the Beyond to wait in an endless line to the Sort Authority.
Connecting the Beyond, the Sort Authority, and Mythopolis City is the Bridge to the Afterlife. This is the bridge where Humans line up to enter the afterlife determined by their religious beliefs. In recent centuries, the Bridge to the Afterlife has gotten more populated with Atheists and Agnostics. Because they didn't believe in an afterlife when they died, these poor lost souls are stuck in limbo, perpetually waiting for their afterlife to begin.