Monstrous Lair #27: Cultists' Hidden Fane provides you—the busy, time-crunched—with the details to effortlessly bring to life the hidden fanes in your campaign. Are you a busy GM? Does session prep take too long? Do you never have time to work on the cool little details that can bring your adventures, dungeons and campaign to life? This short, focused compilation gives you, the time-crunched GM, the tools to effortlessly add verisimilitude and detail to your dungeons. Use the material herein either before or during play and bask in your players' adulation.