Magic has suffused the Inner Sea region for thousands of years. This Pathfinder sourcebook takes a detailed look at the magical traditions of the Inner Sea, including rules for magic variants, examinations of how magic is taught, and how the spellcasters of the region have chosen to specialize in various forms of magic. Also included are two new oracle mysteries, 18 new archetypes for spellcasting classes, a pair of new prestige classes, and a wide selection of unique, unusual, and exciting new spells for all who would seek to master the art of magic.