The world was just a timeless, dimensionless, lifeless... no not lifeless, mess. It was an infinite expanse of monsters and torment and pain and suffering. There was no beginning or end. All the monsters were either too weak or too dumb to create anything.
But then it started to happen. Among the massive infinite expanse, beings came into existence. They created bubbles where no others could enter, and created realms and in those realms were universes and dimensions. But where we are is in a realm created by the Overworld (the closest translation into English). Among the eleven realms that exist in this bubble, we are one: The Limited Energy Realm.
There is the Limitless Energy realm, where there is no limit to how much energy there is. The Corpse, there is absolutely no energy here and it is completely lifeless and dead. The Limited Energy this is our realm. The Life, this is where everything is controlled by life rather than energy. It is the smallest realm, almost as small as a planet. The Sandbox, this is where the afterlife is. Where you go to after death. An infinite expanse of nothing for you to create your own paradise for the rest of eternity. The other six are completely unknown.
Our realm has an infinite amount of universes each one with an infinite amount of alternate dimensions, 4D, 3D, 2D, 1D and everything above and below that.
Our realm has something that no other realm has... Magic. We draw this energy from the constant supply of limitless energy produced by the Unlimited Energy Realm... Welcome.