TRAIL OF CTHULHU: A ROLEPLAYING GAME OF HORROR AND MYSTERY Investigate Lovecraftian horrors in the dark decade of the 1930s!
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.