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My rating: 4 of 5 stars
The wizards of the Order of Hermes wield great power, but they are always questing to learn more. . . Which is where this supplement comes in. The Mysteries is a collection of new magical paths and new secret societies that follow those paths. Alchemy, spirit magic, sacred numbers and geometry, and others are here to make your Ars Magica mags even more powerful.
But of course, power comes with a price. Which is why various internal secret societies exist to shield those following paths that might be forbidden, or cause scandal. Several of these groups are detailed, with information on organization, initiation rites, and the Virtues and Flaws acquired as the magus delves deeper into these lost secrets of magic.
There are even several pathways to true immortality if your campaign lasts that long, everything from the alchemist's Great Work to using necromancy to make yourself a free-willed spirit. But be warned, existing forever might not be all it's cracked up to be.
So all-in-all this is a vital addition to any Ars Magica player's library. Some sections required a few careful readings to really understand the game systems presented, but that's true of almost all AM books.
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