Avian alien assassins taking on fire focused fanatics. Your next adventure in the world of NOVA is here.

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 Codex includes new content to bring different styles and settings to your Monster of the Week games. It’s written by Michael Sands and Marek Golonka, and being developed in partnership with Evil Hat Productions.