Lord Zack's Planescape
Once a blue planet teeming with life, Athas has since been stripped of its fertility by the use of corrupting magic known as Defiling Magic, and the decay of its sun. It is a sun-burnt land forsaken by the gods, water, and hope. The natural resources have been depleted and a lack of metal has resulted in the use of wood, obsidian and bone for weapons, tools and other common equipment. In such a harsh and unforgiving land, even the most mundane of creatures have developed psionic abilities in the constant struggle of survival of the fittest. Little else is known thanks to the Grey, which serves as a barrier between Athas and the rest of the planes as well as the afterlife for the plane. The barrier is permable, but only with great difficulty.