Once again, the world`s intrepid investigators must attempt to thwart the cataclysmic rise of an otherworldly Ancient One. Strange cults are gathering strength in remote corners and bustling cities all over the world. Though the cults seem to worship different gods, the investigators uncover one thread that runs throughout all their evil rites: Nyarlathotep. Known as the Messenger of the Outer Gods, Nyarlathotep is the only Ancient One who still actively walks the Earth to work his will upon humanity. The investigators must stop these cults, or Nyarlathotep will gain enough strength to open the Ultimate Gate, ushering in an unthinkable doom! Strike down these cults in new Adventures, explore ancient mysteries among new Mystic Ruins, and destroy the monstrous followers of Nyarlathotep in Masks of Nyarlathotep, a campaign expansion for Eldritch Horror.