The Unspeakable Oath is a quarterly magazine dedicated to tabletop roleplaying games that are based on the Cthulhu Mythos -- the creations of horror author H.P. Lovecraft, the writers who inspired him, and the writers who followed him. Created and published by game designers, writers and artists who love Cthulhu Mythos gaming, every issue provides ideas, inspiration, tools and techniques to make your games more horrific than ever. The Unspeakable Oath 18 includes: "The Branchly Numbers Edit," a Mysterious Manuscript by Pat Harrigan. "The Chinaman's Screen," an Arcane Artifact by Adam Gauntlett. "The Forgotten," an Arcane Artifact by Dan Harms. "The Art Show," a Tale of Terror by Nick Grant. "House of Hunger," a Tale of Terror by Monte Cook. "Mr. Popatov," a Tale of Terror by John Scott Tynes. "Slight Return," a Tale of Terror for Delta Green by Pat Harrigan. "Tales of Nephren-Ka" by James Haughton. "The Chapel of Contemplation" by Dan Harms. "Black Sunday" by George Holochwost and C.A. Suleiman. "Dog Will Hunt," a 1920s Call of Cthulhu scenario by Richard Becker. "The Word," a short story by Shane Ivey.