The next great campaign from the team that brought you the Words of Radiance Leatherbound, Isles of the Emberdark, and the record-breaking Year of Sanderson!

The definitive guide to the most horrible and anti-life place in all existence.

When the anomaly appeared at the Earth's core, the Substratum Protocol was initiated. You are the best and brightest scientists we have left, our last hope to stem the apocalypse. You are the Substratum Expedition Team. Descend. Learn. Survive.