A Desperate Battle with the Vilest of Dragons! Dark Sun continues to be the most sought-after of the classic TSR Dungeons & Dragons campaign settings, and this third release in the five-part Prism Pentad will continue to bring old and new fans alike into the magic-scarred deserts of Athas. In order to finally defeat Borys, the Dragon of Athas, Sadira will have to reach the Pristine Tower--the citadel from which the dragon was born. But the same dark forces that created Borys still haunt the smoldering ruins.