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.

A full-length adventure for Heart: The City Beneath RPG, written by Gareth Hanrahan and illustrated by Sar Cousins.

The eldritch horror game where you create the mystery at the table. A GMless tabletop game that creates a gripping horror mystery in a single session of play. Surprise each other with brand-new eldritch horrors and guide your character to their doom.