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!

TENTACLES. WHY DID IT HAVE TO BE TENTACLES? A colony of deep gnomes have had their main water source taken over by a group of kuo-toa, but are the fishy folk really the ones to blame for leaving the gem-loving svirfneblin thirsty?… This adventure was originally made for a West Marches campaign, but is designed to easily fit into any standard fantasy setting. There are many areas to insert plot hooks for your own world or campaign. A 4-hour adventure for 5th-7th level characters by ALAN TUCKER

The players get more than they bargain for when answering a night-time call for assistance from a mutual friend. Can they escape the githyanki prison known as the Crucible and find their way home from the Astral Plane? Designed for characters of 5th to 9th level, the Crucible can be played as a standalone one shot adventure, or as the first in a four part series of connected one shots that see the party fight their way to hell and back.

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.

Called by the Elder Elemental Eye to serve, four corrupt prophets have risen from the depths of anonymity to claim mighty weapons with direct links to the power of the elemental princes. Each of these prophets has assembled a cadre of cultists and creatures to serve them in the construction of four elemental temples of lethal design. It is up to adventurers from heroic factions such as the Emerald Enclave and the Order of the Gauntlet to discover where the true power of each prophet lay, and dismantle it before it comes boiling up to obliterate the Realms.

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

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.

The recent discovery of an entrance to the Underdark has set local leaders on edge. In a display of initiative, the First Lord of Hillsfar has ordered the construction of defensive structures surrounding what locals have begun to call "The Waydown." You have been charged with escorting an emissary back to his home in the Underdark without alerting the Red Plumes.

"Fishing for Gods in Strade's Gallows" is a Dungeons and Dragons 5e module designed for 3-5 players at levels 2-3. This module features NPC dynamics where cordial manners and a polite smile matter just as much as sword-swinging prowess. Original monster entries and dungeon maps can be found in the appendices. A medical shipment to the swampy town of Strade's Gallows takes a turn for the eccentric when the party happens across enigmatic shrimp-men who begin to worship them as gods. Can the party solve the mystery of Strade's Gallows' ailment, or will their new disciples botch it all up? This module includes a list of songs which convey the mood of the setting. They are all online so it's easy to make a playlist.

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

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

"For Blibdoolpoolp!!" "The power of the mind and belief are wonderous, often leading us to manifest things that aren’t real. For the kuo-toa, this power is heightened, allowing their collective belief to manifest gods." Two tendays ago, a paladin of Torm was kidnapped by kuo-toa. In a strange turn of events, she was mistaken for a kuo-toa god, and whisked off to their underground lair. Barria has managed to pose as the god and now shakily leads a small faction of kuo-toa while trapped underground. With her influence being increasingly scrutinized, and with the different kuo-toa sects on the brink of civil war, it’s a dangerous time, even for a ‘god’… The heroes’ mission — rescue the paladin from the kuo-toa oceanic lair before she’s transformed into a kuo-toa god. The kuo-toa are an Underdark-dwelling race of fishlike humanoids. Different sects worship different god-like beings, each god manifested through the strength of a sect’s collective zeal. Such “gods” feature prominently in this adventure. Product Overview ♦ 4 to 8 hours for four to five characters. ♦ Scalable for 3rd-6th level. ♦ High-resolution maps of the Kuo-Toa lair. ♦ 9 new statblocks, including Dire Barnacles and Hypno-Cuddlefish! ♦ Includes plot hooks, handouts, rules for faction combat, and more!

The Godless Depths For the first time in eons, ancient aberrations are emerging from the deep ocean. Driven by some otherworldly fervour, they encroach upon the local villages, searching with beady eyes for anyone linked to the Gods. Even now you hear rumours of kidnap, men and women dragged kicking and screaming into the depths.

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?

This adventure is designed for the D&D Adventures League Season 5 - Storm King’s Thunder campaign, and is meant to enhance your party’s connection to important events and NPCs. It is intended for use during Chapter 3 and 4, where your party is roaming the Savage Frontier, and has material enough for 1-2 full sessions. It brings your party in contact with the mysterious Kraken Society, and introduce them to the Golden Goose coin, which will make your players more invested in the events of Chapter 11: Caught in the Tentacles.

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.

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.

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.

When the water source of the city-state of Guerino is poisoned and its citizens enchanted, a group of adventurers must follow the treacherous path deep into Mistfall Mountain and restore balance to the kingdom. Pgs. 91-97

Part 3 of the Shackled City Adventure Path "Wherein a tribe of the Sea Mother's children suffer for sparing the life of a mad prisoner they probably should have eaten." Synopsis: The adventure begins with an Umber Hulk attack in the middle of the city. The fame gained by assisting during the attack allows them to gain the notice of a representative of Davked Splintershield. The group is asked to rescue Zenith Splintershield from a Kuo-Toan temple in the Underdark. But to find it, they have to visit Crazy Jared to locate an entrance to it. Upon journeying to Crazy Jared's, they fight Hookface's offspring. After more travelling, they are able to descend into the Underdark. Once they find the Kuo-Toan temple, they must fight through many hard challenges, only to realize that Zenith is not a prisoner, but instead is a prophet. Zenith does not go willingly, and so must be captured. Pgs. 28-61