'From the back of the book:
A horizon more yawning, more open, than she'd ever thought possible. With chemical gas and leviathan-bone struts, with taut canvas rippling in the storm-winds, they rose from the canopy and crested the wild blue above. Their ship, once bound by the waves of leaf and branch, was free. A tiny speck in the endless, but one full of laughter and hope for a new frontier.
And she remembered the depths.
No less ravenous than the skies, a cloying, clinging darkness that washed over portholes and crept through door-seals like tar. The rustle of the waves above replaced with chittering, keening, and the roars of creatures that would break the mind if fully understood. A constant clamour of life, the thrum of predator and prey and predator again, locked into a cycle pierced only momentarily by the passing of a ship, by the sound of saws on ancient wood. In those moments, the seas were united against an invader. In those moments, she had been prey in a way she'd never felt before.
But for a wildsailor who chooses to dive, the riches are worth the risk.
From the introduction:
Storm & Root focuses on two things more than anything else. The skies above the wildsea, and how one might get there, and the deeper reaches of the undercanopy, the sink and the drown. There are a lot of other things thrown in for good measure, of course, but most of the new Bloodlines, Origins, Posts, Hazards, Reaches and Rules revolve around these two in-play ambitions. Within this book, you'll find...
Mechanics for Pressure, the natural consequence of delving deeper than you should
Mechanics for Scrutiny, the uncomfortable attention a flying craft draws in a world where they remain something of a rarity
Expanded aspects for existing background choices from the core book
New background options for the kind of wildsailor that loves to push the boundaries of exploration
Hazards and reaches themed not just around the heights and depths, but other unusual areas and presentations of the rustling waves