Maddgoth"s Castle (Undermountain trilogy)
This DUNGEON CRAWL adventure returns once again to the hallowed halls of Undermountain and into an adventure like those AD&D game archetypes of years past. This is a stand-alone module and does not require extra support materials. It can be placed easily into a campaign on any AD&D world, but best fits a FORGOTTEN REALMS campaign set in Undermountain or Waterdeep.