The Ironfang Legions secret weapon has been revealed! An ancient dwarven artifact known as the Stone Road allows the hobgoblins to move their forces hundreds of miles at a time, completely unseen. Whatever secretsand vulnerabilitiesthe Stone Road may have lie sealed within the dwarven Sky Citadel of Kraggodan. To enter the besieged fortress-city, the heroes must brave the dangers of the Darklands, including morlock fanatics and their slithering god, and duergar slavers, only to find what they need in long-abandoned corners of the ancient city now dominated by horrors from deep below! Siege of Stone is a Pathfinder Roleplaying Game adventure for 11th-level characters. The adventure continues the Ironfang Invasion Adventure Path, a war-torn homage to classic fantasy adventure in which the heroes defend their homeland from a savage invading army. An ecology of the enigmatic naga, a gazetteer examining the dwarven Sky Citadel of Kraggodan, and selection of new monsters round out this volume of the Pathfinder Adventure Path!