From publisher blurb: This book expands upon the black powder weapons and rules found in the core setting book, SpirosBlaak. Among other things, this book includes: Over 20 new feats involving black powder-level technology Rules for using black powder weapons Over 50 black powder firearms and lots of cannons, medieval mortars, rockets, organ guns and more Black powder-related magical items and new magical item weapon qualities The technologist core class, and the artillery adept, grenadier, marksman and pistoleer PrCs ... and plenty more If you want black powder weapons in your d20 fantasy games, this is THE product to own.