The heroes explore the tomb of a legendary giantslayer before venturing into the Mindspin Mountains in search of the valley where the Storm Tyrant is recruiting giants for his army. The adventurers must confront the numerous giants inhabiting the winding valley before making their way to the giant headquarters, an ancient temple to the giant god Minderhal, which contains a powerful artifact. But the valley of the giants is just a recruiting station, and the Storm Tyrant's stone giant representative has been sending the most promising recruits to a training camp deeper in the mountains.

A Pathfinder Roleplaying Game adventure for 7th-level characters, Forge of the Giant God continues the Giantslayer Adventure Path, an epic campaign of classic sword & sorcery thrills. Several new monsters, details of the faith of the giant god Minderhal, a gazetteer of the Mindspin Mountains, and the next installment of the Pathfinder's Journal written by Greg A. Vaughan round out this volume of the Pathfinder Adventure Path.