Tournament AD&D adventure run at Origins '83 in Detroit. The module title is play on words for the convention venue (Cobo Hall). In part one of the adventure the players must find and gather all 14 magical fire opals to power a pyrohydra statue to defend their homes from the onslaught of the evil Statue of Sliff sent by a neighboring island. In part two the party must place the 14 fire opals in new remote hiding spots. Sold as a limited edition of 750 numbered copies.