Into the Cess and Citadel is a supplemental TTRPG book for those seeking to incorporate a strange, colorful, and terrifying city into their role-playing game. Presented within the book is a comprehensive guide to running adventures or campaigns within a fantastical city, along with an overhaul of the adventuring system to better accommodate the unique challenges and benefits of a sprawling urban environment.

Into the Cess and Citadel is designed to turn the traditional city into a more immersive dungeon-like adventure setting.The book provides rules for everything from small urban-dungeon exploration to a total urban conversion with a world filled with disasters, factions and encounters that react to the player's actions. Along with these rules are a series of generators for creating an urban environment from a 6-mile district down to a single building and an essay on how best to run your urban adventures.