Gambit at Dreadhold is an adventure module by David Christ et al. set in the Eberron campaign setting using the 3.5-edition Dungeons & Dragons rules and designed for the RPGA's Mark of Heroes campaign. It was released in 2005 and has interior art by David Esbrí and maps by Stephen Radney-MacFarland and Rob Lazzaretti. It is intended for four or five 4th-level characters.
“
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. It is designed to challenge 4th-level characters on a mission for the Diggers' Union.”
— Back-cover text