From the back of the book... A Mission to an Infamous Prison The search for the secrets surrounding the Sarlonian puzzle orbs sends agents of the Diggers’ Union to Dreadhold Prison to gain the aid of and insane Inspired murderer. Gambit at Dreadhold 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. Designed to challenge 4th-level Characters on a mission from the Diggers’ Union.