Tome of the Mysteries is an excellent supplement, and could easily count as a requirement to any Mage: the Awakening campaign. The rules are sound, the options open up possibilities to take the game to other directions, and the discussion of Ethics and the nature of Magic are all so well done that they’re essential reading for players and GMs alike. If you were to get only ONE supplement for Mage: the Awakening, make it this one.
This is an excerpt of a full review available in my blog. If you'd like to read it, kindly visit: http://wp.me/p5H0U-4J
[5 of 5 Stars!]