Revised created a whole new world for Mage but not everything could fit in the core rulebook. How do I make Charms or Periapts? Who are the Taftani? Can I have more deets on the Avatar Storm? Adam and Terry talk what you need to know and what you can skip in the Mage Storytellers Companion.
Books mentioned in the intro:
Barlowe's Guide to Extraterrestrials - Illustrations created for various non-Earth species
Barlowe's Inferno - Illustrations of what a hell could look like with few touchstones to Christian thought
Next up: Bitter Road