Complete Champion focuses on the divine champion archetype and provides new rules options for characters who enjoy battling for a cause, defeating foes using divine power, and going on quests that mean more than simply defeating the bad guy and grabbing the treasure. This book also helps Dungeon Masters run quest-themed campaigns and adventures.

In addition to providing various archetypes for characters, this 160-page book includes new feats and prestige classes. It features dozens of deity- and belief-themed organizations, turning religion and holy (or unholy) power into something characters of all classes can use. For the Dungeon Master, this book contains information on constructing and running quests and holy missions. It assists the DM in helping all characters in the party to pursue divine paths simultaneously.