O, Wintry Song of Agony (OGL d20 3.x) (2007)

"From the back of the book. As war rages on multiple fronts, the heroes call together their allies for a strike against a secret, frozen fortress that defends the Scourge. Deep in the icy heart of Northern Ragesia, the Scourge is Supreme Inquisitor Leska's greatest weapon: a device powered by the suffering of thousands of prisoners which, if completed, could annihilate a city from across the world. Tha heroes must assault this fortress deep in enemy territory, but can they destroy the doomsday weapon before they fall victim to a wintry song of agony? A fantasy adventure for 15th-Level characters. Requires the use of a Roleplaying Game Core Book published by Wizards of the Coast, Inc. "