From the back cover:
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(R) game. Designed to challenge 15th-level D&D(R) heroes, it opens the perilous gateway to planar travel.