The Forge of Fury, by Richard Baker, was originally published in 2000 as an adventure for the third edition of the D&D game.
The adventure was published shortly after The Sunless Citadel and was designed as a follow-up to it. Characters who succeeded in that mission and advanced to 3rd level were now ready to take on the challenges of a ruined dwarven fortress.
This purchase unlocks the entire contents of the book version for use with D&D Beyond, including the adventure in digital format in the game compendium and access options from the book in the searchable listings, character builder, and digital sheet.