From the introduction: Cthulhu dreams no longer in his house at R’lyeh Beyond the world of mortal ken lies another, a nightmare world of profane alien gods, blasphemous terrors, nightmarish tomes of eldritch lore, bloodlines tainted by elder secrets, and forgotten places whose very existence makes a mockery of established history. Welcome to that world. Peer behind the veil of sanity you call reality and inside you’ll find: * New options for characters prepared to stand against the horrors of the Lovecraft Mythos. * Dread rituals for summoning alien fiends and communing with ancient gods. * A tour of the many places spoken of in Lovecraft’s tales. * A bestiary of monsters whose existence tear down the walls of sanity. * Advice for playing in the Lovecraft Mythos. Leagues of Cthulhu is powered by Ubiquity Roleplaying System and requires both Leagues of Adventure and Leagues of Gothic Horror.