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!

When an attempt to arrange an early inheritance backfires, a man of lesser ambition than Vanthus Vanderboren would no doubt withdraw into his sister's manse to hide under her skirts and pray that the truth of his patricide remain hidden. Fortunately for Vanthus, lack of ambition has never been a problem. Now the Vanderobrens' prodigal son slinks east along the coast of Blood Bay, lured by rumors of an incredible prize kept in a smuggler's hideout called Kraken's Cove. Yet what he is destined to find there is far more than a lucrative bit of banditry. What awaits him is the savage tide. "The Bullywug Gambit" is the second 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 "Savage Tidings" articles, a series that helps players and DMs prepare for and expand upon the campaign. Issue #349 of Dragon magazine looks into the region surrounding Sasserine, and provides useful information if your PCs wish to explore this area more thoroughly than they do in the course of this adventure. The hidden caves of Kraken's Cove have long served the pirates of the Crimson Fleet as a place to stage their smuggling operations. When their latest cargo backfires, the PCs find themselves faced with something far worse than murderous pirates. Pgs. 12-48

The party has been tasked with bringing the head of the fire giant king Snurre Ironbelly to the storm giant lord Krombaalt, as well as capturing the dwarven traitor Obmi Ironwhisper. Delving into Snurre's stronghold, they will also discover the sinister drow manipulating the giants. The adventure is part of the "Against the Giants" series originally by Gary Gygax, hence the writing credit.

A slaver gang known as the Bloodreavers are terrorizing the countryside from their base deep in the labyrinth under Thunderspire Mountain. But these slavers are only the symptom of a larger threat in the bowels of Thunderspire.

This deluxe adventure takes heroes into the ruins of Gardmore Abbey, a monastery that was once the base of a militant order of paladins devoted to Bahamut. According to legend, the paladins brought a dark artifact back from a far crusade and stored it in their abbey for safekeeping, and evil forces gathered to assault the abbey and take it back. What the legends don’t tell is that this artifact was actually the Deck of Many Things, a force of pure Chaos. This adventure brings characters into the extensive dungeons beneath the ruins - dungeons that are warped and twisted with the raw forces of Chaos surrounding the cards of the deck.

Aleyd Burral, the Risen Hero of Phlan has sounded the call to battle! Intent on retaking her home of Phlan, Aleyd has amassed a surprising amount of support from the citizenry of Phlan, including that of the High Blade himself. But as lofty as her goals might be, the honor-bound warrior seems willing to sacrifice much in her quest—including everything she once stood for.

The sages of Candlekeep have come calling. They’ve come to Port Nyanzaru on the trail of a colleague. He came to the jungle to pursue his studies in solitude some twenty years ago, but within the last year, his regular communications have fallen silent. They are in search of brave (and discrete) adventurers to escort them around the peninsula for a health and welfare check. Are you brave and discrete enough for the job? A Four-Hour Adventure for 11th-16th Level Characters

An expedition to the Amber Temple reveals another major minion of the enemy and uncovers a secret weapon that may help defeat them. Part Ten of Misty Fortunes and Absent Hearts.

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.

Side-Trek adventure When your PCs gain access to the teleport spell, their whole world changes. That simple spell opens up instantaneous, long-distance travel. No more long overland journeys or dangerous retreats through hostile territory. All it takes is clasped hands and a word from the wizard, and poof! The PCs are where they want to go. Except that it isn’t that simple, because teleport isn’t foolproof. The off-target teleports are a matter of scattering your PCs someplace else on the map and forcing them to get their bearings and make the long overland journey anyway. But this Side Trek focuses on the really intriguing column on the teleport chart: “similar area.”

Janos Meer, the powerful underworld figure known as the Beggar King, has vanished. Gribbits - Meer’s right-hand goblin - has tasked a group of neophyte adventurers with getting to the bottom of where his boss has gone, and why. This is easier said than done, of course. The explosive destruction quite accidentally meted out by the Dragon Friends some months prior has made their city a dangerous place. It’s up to the adventurers to follow the clues through the urban chaos, unravel the mystery of the missing Meer, and maybe - just maybe - expose a conspiracy greater than any of them expected. The Gribbits Detective Agency is a Dungeons & Dragons adventure for four 1st-level characters.

Mykon Drift, genius inventor and entrepreneur, has disappeared on the eve of his greatest ever product launch, and nobody seems to know why or where he’s gone. Certain jaded onlookers might think this is for the best, for Drift is a disrupter in the truest sense, and the technomantic marvels he creates often wreak havoc on the guilds and economies of the Sword Coast. But titans of industry like Mykon Drift don’t just disappear for no reason, and his most loyal apprentice is willing to pay to find him. Unfortunately, that apprentice isn’t willing to pay very well, so what they get is the Grib-bits Detective Agency. "The Gribbits Detective Agency Part II" is a Dungeons & Dragons adventure for four 2nd-level characters. It is designed to follow on from "The Gribbits Detective Agency", and should be played in a single sitting.

Every fifty years, a pair of storm titans met to pray in an isolated and well guarded cloud temple. This time, they have obtained a copy of the fabled Ritual of the Primordial Gate and are exploring its secrets in hopes of bringing a lost primordial to the world. Divine messengers are sent to the PCs to enlist their aid in disrupting the storm titans’ efforts.

Long ago, a powerful lich threatened the kingdom and was destroyed by mighty heroes. Though its phylactery could not be found, a powerful curse was laid upon the lich, trapping it inside its phylactery. This fading magic can’t hold the creature muchlonger, so the PCs must enter the phylactery itself in order to destroy the lich before it escapes back into the world. Pgs. 144-149

Often called the “Gateway to Chult”, the exotic city of Port Nyanzaru is built upon a landscape both mystifying and marvelous. However, the city’s vibrant beauty is overshadowed by a mysterious scourge that plagues all within the land. Can the divergent forces within the city discover the truth before all are overcome by this growing threat? Five Four-Hour Mini-Adventures for 1st-4th Level Characters

Numerous towns sit in the shadow of Rak’Sarn, a mountain of flames and death. Each day near sunset, the volcano lets loose a blast of molten rock and ash, and the ancient red dragon Dal’Sarnquin swoops down the mountainside. By the time dawn breaks, another settlement has been burned to the ground. The PCs must track the dragon to his lair and defeat him before more towns are destroyed. Pgs. 196-191

Oblivion is a town like no other. Situated in a hidden valley within a high mountain range and accessible only via air or a secret tunnel through the mountains, it has remained unknown to all except its inhabitants for uncounted centuries. What happens when a natural disaster exposes the town to the world and lets loose an ancient danger at the same time? Will the PCs aid those in need?

Trouble darkens the shores of the Vezdali Peninsula when an earthquake hits, sending part of the village of Palma Flora down into the sea. Seizing their chance a tribe of Sahugain descend upon the village, lead by their leader Selachai, a Sahugain Warlock.

Kravenghast Necropolis is hidden in a valley that was formerly part of a now dead city. It consists of a small cemetery that sits atop an abandoned necromancer's laboratory. The necropolis has been refitted as a temple to Vecna, the undead God of secrets. The mausoleum in the cemetery contains a secret spiral staircase that leads to the underground laboratory. The temple is populated by a twisted cult of Vecna, led by the lich-priest Mauthereign. Pgs. 96-103

Long ago, a local priest created a warded graveyard on a remote hillside. As the years passed, it gained a reputation as a spot whose defenses were powerful enough to keep undead in and tomb robbers out. Adventurers began to bring the remains of any creatures they suspected might become restless in death to the Tomb Steppe for interment, and in time they also sought aid against such creatures from the friendly priest. After his death, a brief spate of undead activity commenced, then died away once again. As the years passed, the tales of undead activity in the Tomb Steppe faded into legend, and colonists began to move into the lands nearby. The town of Night Falls was founded a short distance from the graveyard, and it grew quickly into a thriving trade center and farming community. Realizing that the Tomb Steppe was safe enough during the day, the citizens began burying their dead there rather than building new crypts on pristine farmland. Because this method of interment was cheap and easy, people from many surrounding communities brought their dead to the town as well. The business of burial brought new prosperity to Night Falls, and a guild called the Funerary House sprang up to control the trade. But it seems that the threat from the Tomb Steppe has not entirely been laid to rest. The Great Mausoleum -- the largest and finest tomb in the steppe, has been unsealed, and an apparition has been seen within. Who will go to the Tomb Steppe by night and reseal the tomb? Lest Darkness Rise is a short adventure for four 7th-level characters. In keeping with the season, it has a stronger horror theme than most D&D adventures. This scenario can be used as the climax of a series of adventures featuring its secondary characters, or it can simply be a site-based adventure that the PCs stumble across at the right moment. The scenario is set in a semi-civilized area in the far north, far from cities and churches, where winters are harsh and summers never get very hot. These inhospitable conditions have resulted in a low humanoid population. The scenario need not be set in such a wilderness; a rural farming community far from cities works just as well. The only real requirement is that the area have few settlements. The action takes place in the small town of Night Falls and a nearby necropolis of tombs, mausoleums, and graves known as the Tomb Steppe. As always, feel free to adapt the material presented here as you see fit to make it work with your campaign.