Echoes of the Well of Souls by Jack L. Chalker

THE CALL OF THE WELL For uncounted eons, the Well World had regulated and given order to the universe, and throughout the eternity, Nathan Brazil had been the guardian of the Well of Souls, where the universe's master control lay. Forever wandering and alone, returning to the Well in times of Danger, Brazil had destroyed and re-created the cosmos several times over. But even he wearied of his endless watch, and had enlisted the aid of space pilot and high-tech thief Mavra Chang the last time the universal order required resetting. But now the universe faced a threat more grave than mere destruction. An unnamed and utterly alien entity had somehow been released from its ancient prison and was bent on the corruption of the Well World itself. If successful, it would cause chaos beyond mortal understanding. The Well World needed Brazil and Chang. But when it found them, would they once again answer the call? And though Brazil was immortal, could he even fight the force threatening the Well? For the force was not of this universe - and it had plans for Nathan Brazil...

This book is part of the "Watchers at the Well" series.
Here are some other books from this series: