A short 2-combat side trek: After confronting an ettin and its pet owlbear, the PCs descend into an ancient ruin holding a portal to another plane, protected by a naga, an eidilon and a sea of serpents.

As the story goes, worshipers of Bahamut and worshipers of Gruumsh spent years warring. As the dead piled up, a Bahamut faithful crafted a weapon of devastating power. Most of the inventor’s peers balked at its use, but some felt it was justified. Those few who used the weapon were twisted into mad, dark beings by its corrupting power. The rest of Bahamut’s flock locked them and the weapon away in a dungeon prison. The dungeon and its terrible secret were long forgotten—until a group of rakshasas happened across the ancient tale. Now they seek the weapon for their own designs. Pgs. 132-137

To stop a devastating rampage of giants across the land, the party must venture into the lair of the stone giant thane Arnak to uncover the truth about why he has broken his peace with the neighboring dwarves. In the process, they will have the opportunity to retrieve important symbols of the fight against the giants and uncover a dangerous excavation. The adventure is part of the "Against the Giants" series originally by Gary Gygax, hence the writing credit.

A trek across the Shadow Marches leads weary travellers to Blackroot, a quiet village of ramshackle huts nestled among the darkwood trees. Here, orcs and humans live in peace. However, all is not well. Something evil has crawled up from below, threatening to devour the village and its denizens. Only a party of brave heroes stands in its way. In Khyber’s Harvest, the PCs battle an ancient evil threatening a remote village in the Shadow Marches. The dark power of the planes has grown strong in this place. Depraved cultists and twisted aberrant creatures are dragging innocents down into ancient caverns to undergo a horrific transformation. To save these helpless villagers, the PCs must overcome the terrors of Khyber—a quest that brings them to the attention of the dreadful Belashyrra, the Lord of Eyes.

Darkness looms near Winterhaven! Kobold brigands have grown ever bolder in their attacks, marauding the once peaceful town, and a known explorer has been missing ever since their departure to the excavation site of a dragon burial site. When the party investigates, they will discover that the kobold's leader, Irontooth, bears a tattoo of a ram-headed demon. This is a troubling portent, for the townsfolk will report that this can only mean the dread god Orcus, master of death, has an active cult in that ruined keep! It is up to the party to enter the Keep on the Shadowfell and put a stop to the cult's fell machinations before it threatens all the realm. There they will fight the evil priest Kalarel, Scion of Orcus and seal off the vile portal to the dark realms he is master of. Should the heroes seize victory, glory and treasure are sure to be theirs. But first they must endure the challenges of that dreaded KEEP ON THE SHADOWFELL!

At the behest of Orcus, Demon Prince of Undeath, a mighty deathpriest hierophant has begun assembling a powerful strike force. He intends to launch the first of many assaults on the world, readying it for his master’s arrival. With the help of potent allies and grand rituals, the PCs have discovered a route to the Abyssal headquarters of this hierophant. This delve begins as the PCs teleport from the world to the first of a complex of interconnected chambers deep in the Abyss, linked only by portals. Pgs. 126-131

None know from where the Heresiarch first came, but all remember the night that it did. It rode down from the bleeding stars on a great serpent, hurling bolts of obsidian lightning that shattered the monuments and capitols of every nation. Its infernal army swept aside the defenses of the mortal empires in a single hour, decimating legions once thought to be the invincible fist of humanity's god-kings. Faceless priests - each bearing the symbol of the trident - drifted through the fallen cities and scorched villages on a frigid wind, and when they rose to greet the huddled men and women ringed by their festering, bloated dead, they spoke a single, simple offer: worship the Heresiarch or die. Thousands of crusaders fell tonight so that you might be given this chance. In a last stand that, for the first time, united all of the empires of humanity as brothers and sisters, a way was cleared into an infernal stronghold said to contain a gate to the Heresiarch’s fane. All is silent save for the clangor of distant battle. Surrounded by grim-faced knights and teary-eyed peasants – their hands clasped in desperate hope – you step through the glowing, churning doorway, knowing there will be no help and likely no return. Published by Defy Danger and Save Versus Death

"And they bade their slaves, 'Build unto us tombs to rival the palaces of the gods, for there shall we live or lives and sleep our deaths in splendor.' And the people of Maru-Qet wore their fingers down, broke their backs, burst their hearts to obey. Indeed they raised up great tombs to rival the palaces of the gods. And their masters were well pleased, for it was as gods they saw themselves." The brown dragon Urum-Shar lurks in a strange tomb, plotting schemes only a wyrm of incredible power could understand. Expanding on content from Draconomicon: Chromatic Dragons, this adventure takes the heroes into Urum-Shar’s dark and trap-filled lair, where they will eventually face the powerful dragon herself. The dungeon heavily employs the use of traps, with fewer monsters. The upper tomb consists of a great puzzle of twelve rooms, and the lower tomb contains the dreaded Urum-Shar, an ancient brown dragon and heir to the lost draconic empire of Maru-Qet. The dungeon has special protections against scrying and other divinations, as well as teleportation. Pgs. 55-90

In the aftermath of AD&D Second Edition's "Return to the Tomb of Horrors," the demilich Acererak was thought destroyed. In truth, his spirit lingered and now after eons he schemes once more to achieve divinity. The characters must travel to three extraplanar dungeons, in addition to the remains of the original Tomb, in order to stop this from coming to pass.

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

The city has been plagued by mysterious nighttime assassinations that leave behind no clues about who might have perpetrated them. Divinations from temple of Ioun adherents suggest the guilty parties can be found under a nearby curio shop. The PCs set off. Beneath the shop waits the Poisoned Shadows Assassins Guild, as well as a greater danger than the party expected. Pgs. 54-59

Your PCs are reaching the upper end of the heroic tier. New worlds are opening up to them—they might have already ventured to the Feywild, for example, and made contacts with inhabitants of that magical plane. Now they are ready to take their first steps into the darkness. The Shadowfell awaits... Vandariel, a shadar-kai witch who calls herself the Voice of Pain, is a fanatic devotee of the Raven Queen. She has founded and become the self-proclaimed high priest of a bizarre cult, the Lords of Pain, whose purpose is to bring more fey into the shadow pact with that goddess of death. Although the original shadar-kai entered this pact voluntarily, and the race breeds true, Vandariel is consumed by what she sees as a divine mission to reveal the mystery to all fey—whether they wish it or not. Those who do not come voluntarily to the truth are brought against their will. Dark stalkers move like the night, seeking out and abducting suitable subjects. This Side Trek can serve as an introduction to the dangers of the shadow realm. It works well for PCs who are approaching the paragon tier, since it presents a reasonable challenge for characters of 10th level. It is suitable as a climactic encounter for lowerlevel adventurers, as well. It consists of only two encounters.

Ages ago, the tower stood as a bastion against banditry and marauders. But civilization has long since retreated from this area, and a band of goblin thieves has taken up residence in the ruined tower. Local woodsfolk beg the PCs to rid the place of the bandits before they are victimized again by the goblins of the Broken Tower. Pgs. 18-23

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.

An agent of the King’s Dark Lanterns has stolen a cache of gold from the Brelish exchequer. Hunt him down, retrieve the gold, and thwart whatever else the rogue agent is plotting. Pgs. 28-65

A short mystery adventure with only two combat encounters: An archfey has placed a curse on a small hamlet, putting all the adults to sleep. The PCs must talk to the children to learn what's going on. When they get too close to figuring it out, boggles attack. Eventually the PCs realise they have to compose a short verse of poetry to wake the adults. When they do, an avatar of the archfey attacks in one last attempt to stop the PCs.

Many years ago, Evard came to Duponde to destroy his rival Vontarin, a powerful wizard who lived in a manor at the edge of town. The two mages met near the walls of the abbey of St. Avarthil and dueled all night long with black spells, laying the old monastery in ruins with their magic. In the morning, the surviving friars found Evard dead in the wreckage and buried him in the town’s graveyard. Vontarin was never seen again. Now, almost fifty years after his death, Evard’s final curse is about to descend on the town and everyone within it. Also available in Dungeon Magazine #219 Pgs. 30-90

A flameskull lord that calls itself the Bright Lord of Everburning Fire has taken control of a primordial node deep within the Elemental Chaos. It long ago shrugged off the control of its original creator and now follows its own plans and desires. Top among these is the desire to tap into the power of a fire primordial and increase its own status from undead creature to demigod. Pgs. 156-161

At Restwell Keep, you've heard that fortune and glory await those bold enough to brave the dangers of the Chaos Scar, a valley carved ages ago by a fallen star. The same tales warn that this Chaos Scar draws wickedness to it. Perhaps you can help stem this tide... and gain treasure along the way. While the location is a different keep, this adventure is an homage to B2 Keep on the Borderlands(https://adventurelookup.com/adventures/b2-keep-on-the-borderlands)

The search for a missing paladin takes the PCs deep into the heart of a frontier torn apart by cult wars—and face to face with an ancient evil. The paladin Jaryd set out to find and destroy the Hand of Naarash. He was never heard from again. Now the PCs must retrace Jaryn’s steps across the harsh wilderness and determine what has become of the noble warrior. Pgs. 29-59