Most if not all of my worlds have this system of an afterlife
World 1-15
World 1: the source. Everything and everyone with negativity and positivity is created and born here. You live and die here once.
World 2: When someone dies in world one, you spawn here. If they die here, they can respawn once more. They respawn in an uninjured state. They keep any natural handicaps they may have (bad vision, for example.) and keep their age. If they have died from old age, they age back at a slow pace. At some point it stops and they don't age until...
World 3: They use up their respawn and end up here. Same rules - except they can die three times before being sent to the next world. It keeps going on until World 15.

Once someone manages to go though all 15 worlds, they go to the negatives.

Afterlife: World 0 to World -7.
They respawn in a negative world as until they are too good/bad for it.
World -7: A hellish and difficult environment of the worst people where it is difficult to survive. All that died for the last time in the positives spawn in here - not necessarily respawn here. The ones that respawn here deserve it.
World -1: Not exactly heaven. It's more of a place to relax and take a break. It's most like positive World 1 - most that die here don't return.
World 0: Dubbed "Cube" by Talis. Unknown why to any that aren't her. This world exists purely to get the beings transitioning from negativity to positivity. Any that end up here are allowed to respawn in any world of their choosing, with the catch is that they can't choose World 1 and they will lose their old self with each new death. Most use this to remake themselves as a better and newer person.

World 0 is a pale building with an AI that tells any outsiders this automated message:
"Welcome to World Zero. No good nor evils exists beyond or within these walls — yet it does in the worlds you've inhabited."
[AI proceeds to display a 'Map' of Worlds 1 - 15, showing the worlds as layers.]
"Your worth is there, not here. Make your choice and leave this place."
[AI will read aloud a text summary of the current state of a World if a World is tapped on one time. Includes: Wars, conflicts, technological progress and culture of the area surrounding spawn.]

It's Talis's world of origin. She reports that it used to be drastically different.
"World Null* used to be a land with nature. Those who ended up there were welcomed by ['6 @8!:], who would lead them through paths, forests, and rivers to portals of their chosen world. It would take years of travel - some were even allowed to stay and help. When ['6 2-4] happened, they began to work on technology and magic so energy and effort could be spent on that instead of assisting souls. They hid ['6 214] from outsiders by creating closer portals and building around that. Now World Void* is nothing more than a building."

*Talis calls World 0 "World Null" when referring to World 0 before ['6 2-3]. It is best assumed that she means neutral due to the World being zero - not positive, not negative. Null.
*When Talis refers to World 0 post-['6 2-4] as "World Void". It is best assumed she doesn't mean neutral or negating anymore - more of an absolute lack of anything. Nothing to be positive or negative. Void.