In GURPS Cabal, magic is controlled by the thirty-six decans of the astrological zodiac. Each decan has its own sphere of influence and personality. You might have two or more decans of knowledge say, where one reveals hidden information and secrets, and another focuses on the destruction or creation of knowledge. The turning of the zodiac and its symbolic elements -- gold, an effigy of a ram, etc. -- affect the efficacy of each decans magic. If the house opposing the spell you want to cast is r...
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