Dark Sun: Prism Pentad Books

A Desperate Battle with the Vilest of Dragons! 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.

In a last ditch attempt to save the world of Athas from complete destruction, King Tithian enlists the aid of his former slaves--Rikus, Neeva, and Sadira--and embarks on a desperate mission

In order to fulfill his dream of being a sorcerer-king, Tithian, the new ruler of Tyr, journeys into the Athasian desert to search for an ancient oracle