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!

Deep beneath the Isle of Dread, in a place forgotten by the world of light, an ancient, unfathomable evil festers. Within the desiccated ruin known as Golsimorga, the debased kopru servants of Demogorgon work foul rites, steeping immature shadow pearls in pits of liquid insanity. None from the world above have yet fathomed what terrors lurk beneath the Isle of Dread, nor what mad scheme roils to profane life deep within the city's gangrenous corpse. "The Lightless Depths" is the sixth chapter of the Savage Tides Adventure Path, a complete campaign consisting of 12 adventures appearing in Dungeon magazine. For additional aid in running this campaign, check out Dragon magazine's monthly "Savage Tidings" articles, a series that helps players and DMs prepare for and expand upon the campaign. Issue #353 of Dragon features ways to improve the PCs' vessel, the Sea Wyvern, as they take their adventures back to the seas. When the PCs journey deep under the Isle of Dread to find the source of the shadow pearls, they discover horrors beyond imagining in a haunted underground city perched on sanity's razored edge. Pgs. 28-66

Designed for a party of five characters of at least 9th level, this adventure will challenge players seeking a powerful magic item of the GM’s choosing. A sphere of annihilation has been provided and is woven into several elements of the adventure, but any appropriately powerful item can be substituted if something else suits your campaign better. Though the adventure is designed to test every type of character class, a rogue who can deal with traps is essential, as is a wizard or sorcerer of at least 9th level. Larger groups will have an easier time; parties of four or fewer characters will be in for a very bad time unless you mitigate some of the tower’s more lethal traps and encounters. This adventure culminates in an encounter with devils and a sphere of annihilation. The sphere of annihilation is hidden deep within the tower-and-dungeon complex of Crane the Sorcerer. Originally set atop a high mountain in a secluded and wild part of the world, the tower and dungeon can be relocated to meet the situation in your campign. Crane, an introvert, stayed as far away from civilization as possible, as is detailed below. The tower above the dungeon doesn’t present many difficulties for a group of powerful characters or alert players. It might lull PCs into a false sense of security before they enter the areas where they’ll really be put to the test.

Sewers of the Underguild is an adventure designed for characters of at least 11th level, and characters up to 15th level will find plenty of challenges. Hidden within these narrow passages and filth-filled channels is a guild of vampiric rogues, led by their master Sangre and his aide, a nycaloth called Ankoz. Deadly traps abound, so a skillful rogue will be a lifesaver. Because of the high likelihood of desperate combat with numerous vampiric and monstrous opponents, it is suggested that a cleric and at least two fighters be prepared to beat back the many watchdog monsters the guild employs. You can hide the locales in Sewers of the Underguild in any ruin or location that fits your campaign purposes. A thriving metropolis that just happens to have a large crime and vampire problem would fit the bill nicely. In the Lost Lands campaign setting of Frog God Games, the Underguild is located in the sewers beneath the ruins of Curgantium, the ancient imperial capital of lost Hyperboria. Located at the edge of the modern Kingdom of Foere, the Underguild still finds itself located centrally enough to pull the strings of its weblike network running throughout the former lands of the Hyperborian Empire.

Deep below the surface lies an ancient beholder city called Ilth K'hinax. In times past, hundreds of beholders called it home - until simmering rivalries within their society exploded into warfare. The few survivors fled, leaving the city deserted for hundreds of years. However, the story of Ilth K'hinax's glory was passed down from one generation of beholders to the next. Now, after countless years of self-imposed exile, the beholders are back! After securing the city, the hive mother of Ilth K'hinax implemented a plan to wipe out all the beings living above it. Unfortunately for the beholders, several facets of the hive mother's plan have been revealed through the exploits of a party of adventurers. Now, this group of heroes must meet eye to eye with Ilth K'hinax's newest occupants in an effort to stop the hive mother's pernicious plan! "Eye to Eye" is the last of three adventures featuring the nightmarish beholder. It can be played as an individual mission or as part of the series that began with "Eye of Pain" and continued in "Eye of Doom." TSR 9536

This quest is for a party looking to acquire diamonds to use as components for higher-level resurrection spells. To gather what they need, the characters embark on a brief expedition to the Elemental Plane of Earth where diamonds are fairly abundant. However, the party only has an hour to gather as many diamonds as they can before the portal—and the entire cave area—collapses. Includes a quest-related NPC that a player can control if they're waiting for their character to be resurrected.

The dungeon is essentially a large puzzle built around the premise of time travel. Many PC interactions are a direct result of the party dealing with the actions of their past or future selves. This adventure is designed for a fifth level party, to be played in a single session. It features a large full color map, artwork, NPC roleplaying tips, and two new magic items. Julinda the gnome mage has always been a bit off. She is a chronomancer who has become obsessed with achieving the reliable and reproducible technology of time travel, in the interest of returning to select parts of history and influencing their outcome to her pleasing; perhaps to avert a war, or to head off the enslavement of her people, or prevent the death of a loved one. Those who know her were aware of her ambitions, and now worry that they are coming to fruition, as she hasn't been seen in several months. And so, they have implored the PCs to seek her out...

Stop evil cultists of the Crushing Wave. The party rescues a member of the Brotherhood of the Cloak in Mulmaster (local mage guild); Drayson Fivestar. Drayson asks them to investigate the murder of his colleague. After some urban investigation, the investigation leads to a former guard tower of the Zhentarim, now occupied by elemental cultists. The tower was submerged in mud, but recently uncovered. The party faces of with the cultists. (Large page count, but feasible as a one shot after some editing, will probably take two sessions at most)

This is the laboratory of High Alchemist Sureves Epans. He led a group of alchemists in research for many years, but recently there was a bit of a mishap. He discovered his wife was cheating on him with one of his employees and while in a drunken stupor trying to create a discreet potion to deal with the two of them, he let loose an infectious plague on the lab which turned all but a lucky few in the facility into shambling husks of their former selves., fused with their own creations as their minds turned to know but one thought - rage. This dungeon has rules to modify all encounters for a group of players levels 4 through 6 and is intended for a party of four. If you have more players, feel free to adjust the difficulty up one level for each additional player or simply tune the monsters to your needs. This dungeon contains many original enemies, a unique puzzle, and an environment that is meant to bring a sense of terror and anxiety on your players. I consider this to be the Horror-themed adventure of the module so feel free to add some creepy music and extra details along the way to bring the area to life (or death).

"The creatures are just too intelligent, too crafty, and too strategy-minded to "rampage." Rampaging brings the wrath of oath-bound knights, powerful mages, and divinely-protected priests. Why would a dragon want such attention, unless it had some special secret, or unless it was insane? Or both. The northern reaches of the Derideth Swamp were once plagued by a rampaging dragon. This black dragon, named Storamere, took a mad glee in attacking human villages, wiping out orc camps, driving off the lizardfolk, and decimating farmland. He met his untimely end, though, in an ambush devised by the monks of the Order of St. Chausle. Storamere died with a curse upon his draconic tongue: "you could not have defeated me in my lair," he told his slayers. "I am forever invincible in my lair." Now Storamere is back, with a horde of his misshapen half-dragon offspring, to have his vengeance. All that remains of the once-heroic monks are two old men driven mad by their last encounter with the black dragon, so it falls to a band of adventurers to again defeat the mighty dragon -- this time in his palace, where the boastful Storamere claims he is at his strongest." Includes maps and damage rules for navigating Storamere's lair, a semi-solid palace made of a dangerous, corrosive liquid five feet thick and located on the ethereal plane. Most of the monsters in the lair have the Half-Dragon template applied. Published by Atlas Games

The legendary spellcaster Emirikol the Chaotic has turned the region into a wild magic zone, a place where all magic goes awry. The only way to put things back to normal is to retrieve the source of the problem deep inside the Ooze Chambers of Emirikol! This adventure is for 4th level characters and can be run on its own or as part 3 of the Litany of Arrows adventure path. This adventure contains, 2 pages of new magic items, 8 new monsters and NPCs, a full write-up of Bwimb II, the Paraelemental Princess of Ooze, an entity referred to in many D&D products but never fully fleshed out and stats for the 3rd edition iconic heroes Regdar and Mialee, who play a major role in this adventure. It's got over 10 pieces of original art, full color maps, tagged and untagged, and a special handout for the player who obtains the Ooze Fist of Emirikol. This adventure builds on the story begun in the platinum-selling Castle of Corellon and the follow-up, Warpath of Gruumsh.

Elanil Elassidil, an elf bard of no small legacy, has put out a call for trustworthy agents. It is time, it seems, for a quietly hidden piece of elven history to become known to the world. Meira Faerenduil, lost knight of Myth Drannor, has been dis-covered, and must be brought back to civilization. A four-hour adventure for 5th-10th level characters. **NOTE** As of August 30th this adventure no longer grants an Oathbow in Adventurers League play. It has been changed to award a +2 Longbow per the Adventurers League Content Catalog.

Trapped in the mysterious Castle Amber, you find yourselves cut off from the world you know. The castle is fraught with peril. Members of the strange Amber family, some insane, some merely deadly, lurk around every corner. Somewhere in the castle is the key to your escape, but can you survive long enough to find it? TSR 9051

Men always seek the blood of monsters. Some spill it to avenge their massacred families. Others swim through an ocean of gore to find treasures worth the envy of kings. A few know blood can be a priceless treasure in and of itself. Alchemy has long used the lifeblood of monstrosities as arcane fuel, and of all the legendary beasts, the blood of the gorgon holds the most secrets. Few know the blood's darkest lore, its ability to draw out the monster within every soul. Those who drink gorgon's blood are forever changed, and the darkest horrors of their mind unleashed. The heroes hunt a deadly murderer who stalks the streets of the Free City of Zobeck after nightfall, and cross blades with a guild of monsters who rule the city from below. Lucky heroes might risk no more than their lives. Unlucky heroes must wager their souls in a game where monsters and men dance close enough to share their blood and their fate.

A deadly rumble in the jungle. The wicked Leopard Men might have loads of treasure - but no one has ever met one and lived to talk about it. The Leopard Men are a tribal cult in the jungle who worship the wicked leopard god. They stalk at night looking for suitable sacrifices to their god. A merchant asks the PCs to destroy the Leopard Men to improve his trade agreements with other jungle tribes. Their reward for doing so is all the accumulated wealth of this tribe. The party will investigate the cult by travelling through several tribal villages. The cult members are hidden in these villages, watching for future sacrifice victims. The adventure ends with a battle with the leader of the Leopard Men and a spirit of the leopard god that is summoned. Pgs. 13-27

Something is very wrong in Stormport: Corruption runs rampant among city officials, more and more people turn up missing every day, dark prophesies of Change convert new believers, and rumors persist of a demonic beast with a taste for human flesh that stalks the alleyways. Worse yet, spring is overdue; winter refuses to relinquish its icy grip. Only one vile force could cause such chaos: The illithids have risen up once again, ready to enslave the surface races. Now, as never before, the world needs great heroes, mighty adventurers who will challenge the illithids; dark agenda. A Darkness Gathering is the first of an adventure trilogy (continuing with Masters of Eternal Night and concluding in Dawn of the Overmind) that pits brave adventurers against the brain eating mind flayers. Dungeon Masters can run each individual adventure of the trilogy separately, or they can be linked together to form a seamless, epic-length adventure.

A 5th Edition Fantasy Adventure for 3rd Level Characters The PCs find themselves trapped in a strange labyrinth. They’ve arrived by magical means, and they can’t go back the way they came. They have no idea where this labyrinth is located. As they explore the labyrinth and try to find their way out, they may learn that everything is not as it seems, and the difference between an enemy and an ally can be difficult to discern. Escape is not easy, and a fate worse than death awaits those who fall. Published by Starwalker Studios

A short plug in adventure that can be used as part of a larger campaign or run as a one shot for 3-4 Tier I or II characters. The Twin Temple was once a place where the people of the city can come to and get help and guidance, but change has come to the Twin Temple now. The characters seek to find what poisons this well and how they can get to the bottom of it and who is responsible. This adventure is ideal for for 3-4 tier I and II characters. Playable as a one shot or the start of a larger campaign. The characters are sent to investigate the Twin Temple and see if they can find the root cause of trouble with various clues and encounters in most rooms this adventure is customizable and adaptable to fit into most campaigns as needed.

Dungeon Masters Kit - Number 1 Palace of the Vampire Queen For three centuries the peasants of the Dwarvish island of Baylor have feared the raids of the Vampire Queen and her minions. Sweeping down at night from the palace in the shrowded peaks of the island, they range even further in their search for blood. And not only blood - the children of dwarf peasants often disappear if they are so unfortunate as to be out at night. Even the cities are no longer safe. The most recent victim was the Princess of Baylor, daughter of King Arman, who was taken in a midnight raid on the capitol city of At Toe within past weeks. King Arman has offered fabulous riches and land holdings with titles to the person or persons who can brave the stronghold of the Vampire Queen and return his daughter to him alive and well. But, in truth, he holds little hope. For even King Arman, Ruler of Baylor, Defeater of the Ten Orc Tribes, is afraid in his heart to face the Vampire Queen. Published by Wee Warriors, Distributed by TSR

People keep asking for "beginner" dungeons. Everyone can name "classic" dungeons - Tomb of Horrors, Barrier Peaks, Ravenloft, etc. - but in order for those adventures to make sense, there needs to be some sort of introduction. It's like all the adventures we have are Bach concertos. People keep writing amazing works of staggering genius, but someone needs to write a book on how to play the piano. I had the same questions, and since I couldn't find anything satisfactory, I decided to write the kind of dungeon I would have loved to find. I wanted to write the best basic OSR dungeon for beginners that I could, and I also wanted to show the design process. If you like this dungeon, please share it, tell people about it, print copies and leave them lying around local game stores, or email this post to friends who have "always wanted to try D&D but don't know where to start". The entire thing is and always will be free.