Not only is this a great, incredibly well-written book, if fixes one of the biggest holes the Mage: The Ascension RPG has had since its first edition: Practices.

With this, we finally get systems that mesh together Rotes, Reality Zones, Sanctums and the use of Practices in all of them.

Its also an excellent tool for players, giving them a cohesive toolbox to work with. I would recommend adding the systems in this book to any Storyteller campaign.

In sum, it meshes the ephemeral ideas of Mage with workable systems, which almost sounds like a feat of Magic by itself!