Eldritch HorrorABOUT THE GAME Eldritch Horror is a cooperative game of terror and adventure in which one to eight players take the roles of globetrotting investigators working to solve mysteries, gather clues, and protect the world from an Ancient One that is, an elder being intent on destroying our world. Each Ancient One comes with its own unique decks of Mystery and Research cards, which draw you deeper into the lore surrounding each loathsome creature.