This material was originally published as two separate adventures, D1: "Descent into the Depths of the Earth" and D2: "Shrine of the Kuo-Toa." Contained herein are referee notes, background information, maps, and exploration keys intended for use with the Advanced Dungeons & Dragons rules. The adventure can be used alone or as part of an extended adventure that begins with G1-3: "Against the Giants" and continues with D3: "The Vault of the Drow" and Q1: "Queen of the Demonweb Pits." TSR 9059

The waters of a sunless sea meet a pebble-strewn shore, beyond which opens a wide Underdark vista shimmering with pale cave-light. Titanic columns as big as castles march miles into the misted distance. The wide, steeply sloping base of the nearest colossal column is carved with streets, walls, and elaborate structures, many with gaping, empty windows. A few glimmer with faint illumination. Are you brave enough to explore the spire-city and face the terrors that lurk within? Part 2 of the Barrow of the Forgotten King series. Followed by Fortress of the Yuan-ti.

Having put down a rising of giants, it was discovered that the motivating force behind their depredations was that of long-forgotten evil - the Dark Elves. Determined to seek out these creatures, a body of doughty adventurers mounted an expedition to learn the strength of the Drow and bring retribution to them (DUNGEON MODULE D1, DESCENT INTO THE DEPTHS OF THE EARTH). This module contains background information, a large-scale referee's map with a matching partial map for players, referee's notes, special exploration and encounter pieces, a large map detailing a temple complex area, encounter and map matrix keys, and an additional section pertaining to a pair of unique new creatures for use with this module and the game as a whole. A complete setting for play of ADVANCED DUNGEONS & DRAGONS is contained herein. This module can be played alone, as the second part of a series of three modules (with DESCENT INTO THE DEPTHS OF THE EARTH, D1, and VAULT OF THE DROW, D3), or as the fourth part of a continuing scenario (DUNGEON MODULES G1, G2, G3, D1, D2, D3, and Q1, QUEEN OF THE DEMONWEB PITS). TSR 9020, From 1978

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. Your expedition has dogged the heels of the Dark Elves who caused great woe and then fled underground. 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: "Descent into the Depths"; and Q1: "Queen of the Demonweb Pits"). TSR 9021

Agents of the fire giants of Maerimydra, a city in the Underdark, have overtaken the drow outpost of Szith Morcane. The factions seek out adventurers to free the outpost’s leaders for questioning on the giants’ activities. Can you extricate them before it’s too late?

Taag'thrith, born a gith but transformed into an illithid by ceromorphosis, has been finally found purpose: the assimilation & understanding of all knowledge. Taag'thrith plans to unleash a 10th level spell that will grant him just that-at the cost of all sentient life on the Material Plane. Will the heroes be able to traverse the dangerous corpse of a dead God, find Taag'thrith's aqueous lair the Eternal Spirals, & pit their foes against one another in order to destroy the foul lich once and for all? Or will they fall prey to the threats trapped within the Eternal Spirals & sink beneath the surface forever? They Came from the Deep is the second installment in Pretty Little Liches: a trilogy of adventures centered around three unique liches and their lairs designed for high-level play. These three lairs and the surrounding regions can be run independently as individual adventures or tied together into a mini-campaign that centers on the destruction of the Green Hand, an organization of dangerous liches.

In the city of Waterdeep rests a tavern called the Yawning Portal, named after the gaping pit in its common room. At the bottom of this crumbling shaft is a labyrinthine dungeon shunned by all but the most daring adventurers. Known as Undermountain, this dungeon is the domain of the mad wizard Halaster Blackcloak. Long has the Mad Mage dwelt in these forlorn depths, seeding his lair with monsters, traps, and mysteries—to what end is a constant source of speculation and concern. This adventure picks up where Waterdeep: Dragon Heist leaves off, taking characters of 5th level or higher all the way to 20th level should they explore the entirety of Halaster’s home. Twenty-three levels of Undermountain are detailed herein, along with the subterranean refuge of Skullport. Treasures and secrets abound, but tread with care!

The Fate of Faerûn Lies in Shadowy Darkness! Daggerdale is reeling from a sudden series of murderous drow raids. As a grave threat to the entire surface world develops in the war-torn dark elf city of Maerimydra, intrepid heroes must discover its source and destroy it, if they can.

Written by the setting’s creator, incomparable RPG author Monte Cook, Ptolus: Queen of Lies is an action-packed fantasy adventure painstakingly re-designed for Ptolus: Monte Cook’s City by the Spire. Involving numerous challenging scenarios for characters of 11th level, Queen of Lies is filled with dozens of dark elf personalities, cunningly showcasing their alien culture—a world of merciless betrayal and sinister lusts. Deep below the surface, in the sunless lands of the Netherdeep, creatures of darkness build weapons and amass armies, dreaming of invasion. An attack on a peaceful elven shrine in Emerald Hill sends the heroes on a quest to retrieve stolen artifacts and kidnapped friends. All signs point to the actions of the dark elves of Ul-Drakkan, far below the city of Ptolus. However, even within that ancient fortress, there exists a deeper darkness.... Underground enemies lurk beyond every twisting passage, and strange creatures abound. The foul culture of the dark elves is both decadent and cruel, and the heroes may discover that they’ve stumbled into a web of deceit and treachery spun by the self-styled queen of the dark elves. Can the player characters complete their mission without being discovered, or will they find out, perhaps too late, that their actions been orchestrated all along by the wicked Queen of Lies? Published by Fiery Dragon Productions

The Cave on Foggy Hook is the first of three connected adventures in the village of Hookholm and is aimed at busy or first time Dungeon Masters. This adventure is designed for 3-5 1st level characters and can be played in a single 3-5 hour session excluding character creation. In this adventure the party will find themselves in Hookholm, a small coastal village rebuilding after a devastating storm almost wiped it off the map. The village is located on the inner curve of the Foggy Hook, a spit of marshy land jutting into the Grey Sea. Beset by the sort of calamities that new adventurers will be able to sink their teeth into and will offer opportunities for roleplaying, puzzle solving, exploration and combat. Includes 5 maps in a number of variations, a brand new monster in the vicious Kuo-toa Feral, and a new chase complications table for chases through swamps or marshes.

A group of mysterious, sea raiders— capable of appearing from out of nowhere, striking, and disappearing— has terrorized a group of coastal states for some time. Now the leader of the states has asked the characters to infiltrate the raiders, find out how they operate, and put a stop to their activities. But once the heroes join the raiders, things aren’t as clear as they were led to believe. Will they succeed at their mission? Or join the raiders themselves? Pgs. 54-82

An escaped duergar slave stumbles into the village of Elventree. With her she brings a malady that grips the small settlement in a bout of madness that seems unshakable. Can you find the source of the madness and save yourself and the village’s inhabitants? A four-hour adventure for 5th-10th level characters.

Ranked in 2004 as the single greatest adventure of all time by Dungeon magazine, this is a compilation of three series of modules: the G series "G1-2-3 Against the Giants" (G1 Steading of the Hill Giant Chief, G2 Glacial Rift of the Frost Giant Jarl, G3 Hall of the Fire Giant King), the D series (D1 Descent into the Depths of the Earth, D2 Shrine of the Kuo-Toa, D3 Vault of the Drow), and Q1 Queen of the Demonweb Pits. The characters begin by attempting to stop giant raids that have become prolific. They find out that the giant alliance is caused by the drow. They then descend into the Underdark in order to find the drow and stop their sinister plan. TSR 9179

A desperate father, a missing girl, and a simple investigation - but nothing is ever simple. As you peel back the layers of mystery, you uncover a dark god, vile sorcery, and a malevolent cult set to unleash horror upon the land... Horror in the House of Dagon is an enthralling and exciting adventure, with lots of role-playing, exploration, and horrifying combat encounters! This adventure is designed for 1st-4th level characters, and will take 3-6 hours to complete.

A recent earthquake has brought forth ancient evil from beneath the waves, to terrorize a sleepy coastal town. People are disappearing. The heroes will sail to an ancient, steam-powered temple in the ocean. They'll encounter mad fishmen, deadly traps, and ancient horrors that slumbered until now.

This book goes over the various rules around the faction of the Order of the Gauntlet in Phandalin and the Forgotten Realms, making it easy for any new or veteran DMs to integrate it more into the core stories being told, and making the faction feel more useful for the players that choose to join. In the adventure, the characters are tasked with exploring the depths of the Old Owl Well.

"Something Fishy" - a Celtic-world campaign. "Iasc" is set in a small Celtic kingdom that can be fit into any medieval/fantasy campaign. The PCs need not be Celts. The likelihood of combat is very high, and the party is recommended to host several warriors.

As adventurers, you may think you have seen everything: certainly your skills have brought you through unimaginable dangers. But now you suddenly find yourself in a place unlike any through which you have traveled: astounding, dangerous, and even amusing things confront you as you journey, both indoors and outdoors, through unique and wondrous realm of Dungeonland. This adventure was first conceived by E. Gary Gygax as part of the Greyhawk Castle dungeon complex and has been the source of challenge and fun for many skilled players of the Advanced Dungeons & Dragons game. It is finally available to all players and can be added to your existing campaign with ease. "Dungeonland" is also designed so that it may be used along with its companion scenario, EX2: "The Land Beyond the Magic Mirror." Still, "Dungeonland" may easily be played on its own, and should offer hours of excitement in its strange landscape! TSR #9072

No-one knows why, but many of the villagers of Greenmist have been going insane. Not only that, but something has caused the surrounding environment to transform into fetid swamps. Heroes from far and wide have gone into the swamps to destroy the source of the madness, but none have returned. The truth is that the psychic whispers of an aboleth have invaded the minds of Greenmist's people. The creature called Seedooloo has been using forbidden magic, mad science, and the strange ability of his kuo-toan worshipers to grant himself the power to drive the surface world to insanity. The Call of Seedooloo includes monsters found in Mordenkainen's Tome of Foes.

The Underdark is a subterranean wonderland, a vast and twisted labyrinth where fear reigns. It is the home of horrific monsters that have never seen the light of day. It is here that the dark elf Gromph Baenre, Archmage of Menzoberranzan, casts a foul spell meant to ignite a magical energy that suffuses the Underdark and tears open portals to the demonic Abyss. What steps through surprises even him, and from that moment on, the insanity that pervades the Underdark escalates and threatens to shake the Forgotten Realms to its foundations. Stop the madness before it consumes you! Note for DMs: This adventure is not for the faint of hearted, to run or to play. The module starts with 10 NPCs traveling with the party through the grueling Underdark. This number can grow. The encounters within the book are often incredibly deadly for the characters that would be going through it. This is because the module expects them to run or talk their way through the events, or, in some cases, the module expects them to lose. If your players aren't the kind of party to run, talk, or surrender, do not get this adventure. The module almost requires that you use milestone leveling because the experience provided does not commonly get players to the levels they should be once they get to certain milestones in the story (7th when they leave the underdark, 15th when they face the demon lords.) Good luck and happy questing.