If I picked up the sourcebook GURPS Thaumatology, would I need GURPS Magic? There seem to be a lot of negative reviews of 4th-edition GURPS Magic and nothing but rave reviews of Thaumatology.
[RPG] Does GURPS Thaumatology require GURPS Magic
gurpsgurps-4emagic
Best Answer
According to "Introduction: Current Cross-References" (GURPS Thaumatology, p. 5), the book is designed to stand alone and doesn't need GURPS Magic. The book presents alternatives to the spell system provided in the Basic Set, as well as some modifications of the default spell system.
If you are using the spell-magic rules from the Basic Set, then GURPS Magic will be relevant (though not needed), but you could easily turf the generic spell system entirely and implement magic in your game world with one of the Thaumatology magic system alternatives.