Using the information in this d20 sourcebook, you can introduce religious conflict into your campaign world as both a background and foreground element for all levels of play. Low level characters can take part in crusades, joining an army or signing up to one of the crusader orders. At mid-level they can undertake special missions to capture or destroy a temple of another cult, as well as lead entire formations of a crusading army. Finally, high level characters might themselves call for a crusade and seek to raise followers to build up an unstoppable force of belief, charged with the destruction of an heretical enemy.