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D3: Vault of the Drow
As a member of a bold party of adventurers, you and your associates have trekked far into what seems to be a whole underworld of subterranean tunnels-arteries connecting endless caves and caverns which honeycomb the foundations of the lands beneath the sun.
From the entrance to this maze found on the lowest level of the Hall of the Fire Giant King, your expedition has dogged the heels of the Dark Elves who caused great woe and then fled underground, but accidentally left a map which has enabled pursuit.
All along the route, signs of the insidious Drow have been noted. It is now evident that the Dark Elves pass freely throughout this underworld, but it is just as evident that these evil elves are hated and feared by the other intelligent races inhabiting the subterranean lands. This does not give cause to hope that your party will receive any substantial aid, for most of the creatures dwelling in the sunless places beneath the earth are as evil as the Drow. The vast majority of the denizens of the underworld are as inimical to you as are the Dark Elves, and that enemy will certainly be alert, not complacent, as they too must deal with powerful enemies continually in order to survive in this grim and ghastly underworld.
This module can be played alone, as the conclusion to module D1-D2: Descent into the Depths of the Earth, or as the third module in a series that forms a special extended adventure (G1-G3: Against the Giants, D1-D2, and Q1: Queen of the Demonweb Pits).