From Introduction: Welcome to Chains in the Dark, to be used either as a standalone adventure or as part of the on-going Opus Operandi campaign setting. Everything needed to run this adventure is included within. Some of the details may conflict or not fit in with your own campaign if you are playing in an alternative setting. Named places and histories have been kept to a minimum and are easily changed. Each Opus adventure highlights and introduces a different aspect of the Opus world. Chains in the Dark is the first adventure of the Pantheon series, introducing one of the Opus gods into your game, in this case Jetava, goddess of the air, the wind and the light.