Following the threads of a hidden conspiracy in this adventure, the PCs find themselves up against insane cultists, wild chaos magic, and horrors from the primordial days of the world. The quest culminates in their attempt to stave off the Night of Dissolution: a dark time long foretold when the slumbering Galchutt will awaken in their hidden lairs deep below the city and bring catastrophe and woe to the world. The Night of Dissolution is an adventure for 4th-level player characters that most likely will take them to 9th level. The events in this book involve investigation, intrigue, action, and dungeon exploration. This adventure was written as a companion to Ptolus: Monte Cook’s City by the Spire, a d20 campaign sourcebook describing the fantasy city of Ptolus. It is designed to pick up right where the adventures in Chapter 33 of that book left off, although the story arc of The Night of Dissolution deals with a different focus. This book is a collection of six linked scenarios, each of which could be used separately.