From publisher blurb:
Great Danger Wrought in Secrecy
Legendary forgemasters now serve an evil warlord and his dark purpose. Their hammers ring upon anvils dedicated to remaking a terrible weapon that was destroyed in ages long past. As the very fate of the world is being shaped, only the strongest heroes can shatter the diabolical plan.
"Lord of the Iron Fortress" is a stand-alone adventure for the Dungeons & Dragons game, the seventh adventure in a series of eight designed to take players from the beginner to advanced levels of play (although no other adventures need be played to play this one). This adventure contains an additional 16 pages of content for the same price as earlier adventures. Designed to challenge 15th-level D&D heroes, it opens the perilous gateway to planar travel.