There are all kinds of mystic societies out there with robes and hats and interesting traditions, but this identity describes membership in one that works. They really do train people to think, act, and feel in patterns that make magick rituals work better, or at all. The nature of an individual character’s thaumaturgical training is up to the player, and may imply different features, but here’s a pretty standard stock version:
I’m an Authentic Thaumaturge, of course I can read a couple dead languages, spot mystic symbols incorporated into everyday objects, babble disturbingly.
Substitutes for: Knowledge.
Feature: Casts Rituals.
Feature: Every Authentic Thaumaturge starts play knowing two minor rituals of the player’s choice, or two chosen by the GM as being particularly likely to be useful (unique).