Plunge into the nightmare realms of Hollows and slay other people's personal demons. Hollows' unique tactical combat system allows for dynamic positioning and tactical gambits, and makes combat spectacular.

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.