This is a Dark Sun campaign, set in the desert age of Athas.
“Athas is an endless wasteland, yet it has a majestic and stark beauty. When first light casts its emerald hues over the Sea of Silt, or when the sunset spreads its orange flame over the Mekillot Mountains, the world’s feral beauty stirs the untamed heart in each of us. It is a call to take up spear and dagger, to flee the cities, to go and see what lurks out in the barrenness.”
-The Wanderer’s Journal