From publisher blurb:
A Wealth of Terra Incognita to visit
Realms of Magic & Mystery expands the setting of Scion Second Edition with details about 28 new Terra Incognita, six new Axes Mundi, and a wealth of additional information about otherworlds and how to use them in your series.
Realms of Magic & Mystery requires Scion: Origin and is compatible with all of the other Scion Second Edition books. Inside, you will find:
Expanded information about several Underworlds, including Elysium, Mictlán, Valhalla, and Yomi
More than 20 entirely new otherworlds, including 10 strange places, eight Midrealms, and several new Overworlds and Underworlds.
Advice to Storyguides for creating new otherworlds, including step-by-step instructions for creating them.
New Boons, Callings, Knacks, and Relics that are either associated with the various realms in this book or that help characters interact with and travel between realms.