An official OSE supplement of demons, cults, and dark magic.

Ars Magica's deluxe edition with vastly expanded text, new art and graphic design, and luxurious upgrades.

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.