In the three centuries after the Catacendre, the men and women of the Elendel Basin thought they'd conquered the world with their science, civilization, industry, and the powers of Allomancy and Feruchemy. But this is Scadrial, and there's always another secret. From the shadows of the past echo rumors of immortal shapeshifters pursuing mysterious agendas, ancient relics wielded by great heroes, dark blood magic thought lost to time, and an undiscovered people come from beyond the horizon in flying ships. Why have these mysteries been revealed now, and what others may yet be found? Time to gather your posse and find out! Masks of the Past is a supplement for the Alloy of Law game supplement and campaign setting. It expands on the events and secrets in Brandon Sanderson's novels Shadows of Self and The Bands of Mourning. It contains a wealth of new world information, game rules, and advice for setting your story in this exciting era.