The Gearbound Grimoire of Ballistics

A heavy, rectangular tome bound in brushed brass and reinforced with steel rivets. The cover features an embossed, clockwork-style diagram of a hammer and cylinder. Its pages are made of thick, oil-resistant vellum and are filled with precise technical drawings, chemical formulas for black powder, and metallurgical instructions. When opened, the book smells faintly of sulfur, charcoal, and high-grade machine oil.