Silver Mount has long beckoned explorers and adventurers from across the Inner Sea with its promises of exotic, otherworldly treasures. Yet more than treasure waits within the alien chambers within this towering ruin; here, the greatest of the Iron Gods dwells, inexorably drawing its plans against the world of flesh and preparing for its final triumphant emergence from the eons of time. With allies recruited from across the land of Numeria and the brutish rulership of its capital city (for the time being) cowed, the time is right for the most extensive expedition into Silver Mount's mysterious interior. What strange perils from beyond the stars await the heroes within the metal walls of one of Golarion's most legendary dungeons, and could they just be walking into an Iron God's trap?