Athas is a desert world. It was originally a watery world inhabited by halfings. This was The Blue Age, and it ended from life-shaping gone wild. The Green Age begins with the rebirth races created by the last of the nature masters and psionics appeared. The nature masters became pyreen, and then one of them, Rajaat discovered arcane magic, and began The Cleansing Wars to kill off the rebirth races. Rajaat’s champions turned on him and became the sorcerer kings. Over time the lush vibrant world was drained by defiling to the desert plan of tody.