Sandstorm

From the back cover:

Sweltering temperatures, bone-scouring windstorms, and other dangers threaten explorers in waste environments. From arid deserts and volcanic regions to ash-choked dungeons and the lava-filled layers of Gehenna, unwary travelers may fall victim to the unrelenting hazards that await.

This supplement for the D&D game explores the impact of desert conditions and extreme hot weather environments on every aspect of game play. Along with rules for adapting to, navigating through, and surviving hazardous hot-weather conditions and terrain, Sandstorm also includes new races, spells, feats, magic items, prestige classes, and monsters associated with deserts and other wastelands.

Expanded by;
Temple of the Gleaming Sands