The Diamond is the world. The world is the Diamond.
There is nothing beyond the Diamond.
Even if someone did manage to climb the walls of the Diamond, they would never come back.
And the walls of the Diamond stretch impossibly high.
The Diamond is divided into three areas: the Outer Ward, the Greensward and the Inner Ward.
The Outer Ward is a vast expanse of metallic gray wasteland where nothing made of flesh and blood can survive for long. Automata and the ghosts of the dead lurk in the Outer Ward.
The Inner Ward lies at the heart of the Diamond, a desert of poisonous yellow crystals where the Sun rises and falls each day.
The Inner Ward is utterly fatal to all creatures who enter it, even briefly. Living creatures die. Automata collapse. Spirits disintigrate.
The Sun does not cross the sky in the Diamond. It rises from the Inner Court, and then descends back into the depths of the earth.
A day in the Diamond lasts about twelve hours.
When the Sun has disappeared, the stars begin to glow softly above the Diamond. The Moon emerges from the Eastern Tower and rides her chariot in a circular pattern over the Diamond before returning to the Eastern Tower.
The Moon is literally a beautiful woman who rides across the sky in a magic chariot pulled by six winged goats.
A night in the Diamond lasts about twelve hours.
The Greensward lies between the Outer Ward and the Inner Ward and is where the Diamond's populace lives.
The Greensward contains forests and grasslands, hills and lakes, some small mountains and the rusted ruins of colossal ancient war-golems and the bleached bones of ancient giant beasts.
There are only three major population centers in the Greensward: Redfern, Metallica and Cistern.
Wild animals, malevolent spirits and rogue automata are the biggest threats in the Greensward.
Hunters hunt wild animals.
Exorcists bind malevolent spirits.
Troubleshooters find and fix rogue automata.
People get around mostly on foot, but bicycles and sky-ponies are popular too.
There are vending machines around the Diamond. They sell everything from food and drink to magic potions, cursed items, bones, used elf panties (don't ask!) and odder things.
The vending machines are serviced by the vending gnomes. No one knows where vending gnomes come from or why they do what they do.
Do not approach the vending gnomes! They bite!