- "The Great Mystery is the bloodstream of the universe, and sorcery is the way to its energy. Sorcery is not magic. It is not skill. It is not thought or knowledge."
- —The High Aldwyn, in Willow: A Novel
The Great Mystery was an eternal entity of infinite power which constituted the "bloodstream of the universe." By channeling its power through sorcery, certain creatures with natural dispositions could produce supernatural effects or control events in nature.