Sanctum is a sourcebook for the Heart RPG. Inside, you'll find a guide to building havens with your group to create the basis for an exciting campaign. You'll also find advice on running haven-based campaigns, special fallout results that reflect your settlement's trials and tribulations, and ways to create and reinforce bonds with the people within. Finally, you'll find rules for four new types of angel, the fell-handed messengers of the Heart Itself which infiltrate and smash apart havens. You'll also enjoy in-character ramblings on them from washed-up pulp fiction author Gris Hannemann who, potentially, invented them to sell more copies of his book. But they're real now.