This DUNGEON CRAWL adventure returns once more to the hallowed halls of Undermountain, but it's a different day. At dawn of Highharvestide 1369, every practitioner of magic on the Sword Coast knew there was a problem. By midmorning, the Lords of Waterdeep confirmed the ill omens: Some brave souls worthy of the title "Hero" must enter Undermountain on a mission to save Halaster Blackcloak! Could these heroes be your group of player characters?This is a stand-alone module and does not require extra support materials. It can be placed into a campaign on any AD&D world, but best fits and impacts a FORGOTTEN REALMS campaign set in Undermountain or Waterdeep.