1978 · ソースブック（プレイを拡張するルール／オプション）

Authentic Thaumaturgy (First Edition)

This reference work examines occult traditions, parapsychology, ceremonial magic, and other belief systems to help fantasy simulation games portray magic more realistically. It discusses how real-world magicians and religious practitioners use spells, rituals, and psychic practices, with guidance for adapting these ideas to playable game systems.