The year is now 1812. War rages on. Armies and Navies clash, aided by the sorcery of battlefield magicians. With the magical playing field essentially levelled by spies and other information leaks, the Great Powers have now begun looking elsewhere for assistance. Using the d20 rules, all characters in BPCI should be human.
Clerics are a special case.
All other magic users use the Sorcerer class. One thing which should be added to the mix, however, is the effect of Cold Iron on magic. Cold Iron is a special, alchemically prepared metal. However, no-one carrying Cold Iron is capable of casting spells. Musket balls made of Cold Iron will deliver normal damage against demons who cannot otherwise be harmed by normal weapons.