2009 · ソースブック（プレイを拡張するルール／オプション）

GURPS Thaumatology: Magical Styles

This supplement develops magical styles as distinct schools, orders, guilds, and philosophical traditions within a fantasy campaign. It provides tools for grouping skills, spells, and other abilities into cohesive styles, reorganizing colleges and prerequisites, and creating spell lists for beginning wizards. New Magic Perks and guidance for adapting the system to clerics and other spellcasters support varied approaches to magic. A detailed example of the secretive Onyx Path demonstrates how these ideas can be applied in play.