The Dark Ages era welcomes Call of Cthulhu players and keepers into a world of harsh existence and ancient horrors. Fully compatible with Call of Cthulhu, Cthulhu Dark Ages sets the clock of Lovecraftian horror back 1000 years into the Middle Ages, and introduces the Old Grimoire of spells, develops the notion of the Otherworld and spirits, and features several scenarios that bring clarity to this dark, grim world.