Greyhawk: Gord the Rogue, Book 07 - Dance of Demons

The life of the young thief and adventurer Gord has been building toward a climax for years. Now, in Dance of Demons, the climax has arrived.
In his role as the Champion of Balance, Gord journeys with his comrades to the depths of the demon-infested Abyss and the sublime majesty of the Celestial Sphere. He battles to gain possession of the magical key that holds the secret to loosing the power of Ultimate Evil upon the cosmos.
The forces Gord encounters are much greater in scope than “merely” Good and Evil. The masters of Time, Probability, and Entropy also have something to say about how this reality-shaking conflict will be resolved—and they will be heard!