From the back of the book... Monster City! Beyond Breland’s western border lies a kingdom of monsters ruled by hags called Droaam. The gate to this kingdom is the savage city of Graywall. The Graywall Incident is an adventure for the Dungeons & Dragons game. It can either be played as a stand-alone adventure, or as part of the Mark of Heroes campaign offered by the RPGA. It is designed to challenge 7th-level characters as they search to secure a magical artifact from an ogre mage.