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

"The Keepers of the Celestian Order, valiant defenders dedicated to destroying horrors from the Far Realm, have trapped a beholder in its lair. However, the evil aberration has proven far more dangerous than expected, and the Keepers need the help of adventurers to end the threat of Omaranthax once and for all. This Dungeons & Dragons Roleplaying Game adventure, created for Free RPG Day 2012, pits player characters against a mutated beholder and its vile underlings. Although set in the Forgotten Realms campaign setting, the adventure can be easily adapted to any* D&D world." *: The adventure mentions that it is suitable for any setting touched by the Spellplague.

The Raiders’ Hideout is a series of underground chambers (or perhaps the interior of a pyramid) that serves as a base of operations for a band of gnoll desert raiders. The PCs have come to exact a measure of justice for recent brutal caravan raids. They’ve tracked the gnolls to their lair, where they intend to end the threat to desert trade once and for all. Pgs. 30-35

The Raven Queen’s servants often seek out mighty allies. One of these is the black dragon Quetzallus, who resides in a deep cavern on the Shadowfell guarding a stream of souls flowing into the Raven Queen’s realm. But a death knight named Raxikarthus, betrayed by the Raven Queen in life, now seeks to enslave this dragon for his own purposes. He madly believes that he can stand against the Raven Queen, and seeks allies of all stripes—even her own servants—to do so. The death knight has found a pathway into the Shadowfell thought closed by mortals. Beneath a decayed keep, the undead dragonborn has reopened this portal and led his forces into the Shadowfell itself. The PCs are called in to beard the death knight in his lair. They find it abandoned, but discover a strange passage in the lower reaches. Pgs. 162-167

There was no greater scholar, explorer, or collector of antiquities in the area than Hallomak Stromm. The enigmatic Stromm recently passed away, and the PCs have received personal invitations to appear at the public reading of his will. Pgs. 72-77

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)

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

It's a frigid New Year's Eve, and the heroes gather near midnight in a small condemned tavern wihtin the Free City-State of Gate Pass. Located in the mountain pass which separates two hostile nations. Gate Pass has been neutral since the end of their last war. That neutrality is about to be put to the test, as a scourge comes for the city from the nearby empire of Ragesia. By now, every magic-user in Gate Pass knows of the Scourge. The Emperor of Ragesia died barely a month ago, and a witch named Leska has moved to cementer herself as the next empress. Leska leads the Ragesian Inquisitors, clerics specialized in countermagic and has decreed ass disloyal mages to be tracked down and killed to prevent future threats to the empire. Their first target is Gate Pass, whose neutrality has long been viewed as an insult to the nation's honor. This is the first of twelve adventures in the War of the Burning Sky adventure path from E.N. Publishing.

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!

The adventurers have delved into the Abyss to strike at the Demon Lord of Undeath, Orcus. On the layer of Thanatos, the Blood Lord has many outposts from which he spreads his corruption. One of his primary lieutenants is Doresain, the Ghoul King. If the PCs kill Doresain in his lair, they will strike a real blow against the foul demon lord. Pgs. 174-179

A deathpriest hierophant of Orcus has turned the lower catacombs of a cemetery into a base for the undead and demonic horde it is gathering. The deathpriest loses control, however, with the arrival of a balor, and its carefully orchestrated forays to snatch victims have turned into wholesale slaughters. The PCs arrive in a nearby town to meet with a merchant who promised to sell them a long-coveted magic item. They are not altogether pleased to arrive to find the aftermath of a brutal attack—and no sign of their item. Pgs. 150-155

A newly constructed temple of Bahamut lies along a road outside a rural township. As the PCs approach the place, a scream for help erupts within it. Pgs. 60-65

New to Loudwater, the heroes learn of a tower locked in ice in the nearby wilderness. Traveling there, they discover that the tower’s master left many surprises behind for the unwary. Also available with e 5e solo conversion: https://www.dmsguild.com/product/247505/DD-Solo-Adventure-Menace-of-the-Icy-Spire-5e-Solo-Conversion Pgs. 4-22

The outpost of Fort Dolor has experienced an unprecedented stretch of peace in recent times. Then nearly the entire garrison disappears on a supposed routine patrol, and the town— still on the frontier— is left nearly defenseless. Can the adventurers dig to the bottom of the mystery at Fort Dolor before they, too, disappear? Pgs. 82-103

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

The Tower of Zoramadria is hidden away in the Feywild. The tower is an arcane academy under the tutelage of the lich Parthal. Parthal and his students lead serene lives of study and contemplation, except when they engage in a bout of bloody necromantic research that requires innocent souls as vital components. Parthal has a score to settle, and the Feywild itself might shudder and scream before the lich has had his revenge on those who killed his love. Pgs. 104-111

A band of evil fey, led by a corrupt bralani, has raided an eladrin city and kidnapped several respected elders. The fomorian king claims the rogues don’t act on his behalf, but the eladrin city threatens the fomorians all the same. To prevent war, the PCs travel through the Underdark of the Feywild—a wondrous place filled with the beautiful and the horrifying—in search of the evil fey and their captives. Pgs. 96-101

Uncover a Hidden Legacy A lost passageway on the upper level of the most infamous dungeon in Faerûn has recently been uncovered. When a patron hires a band of adventurers to brave the dangers of Undermountain, a search is on to uncover secrets of an apprentice of the dungeon’s lost creator – Halaster.

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.

E2, following up on Death's Reach, the PC's first travel to Sigil following the smuggled remains of the primordial Timesus. The pursuit then leads into the Abyss, through the White Kingdom to face Doresain, the Ghoul King, exarch of Orcus. The module certainly is epic, placing the PCs up against powerful monsters like greater demons, death knights, and a demilich. It may be frustrating that the PCs arrive too late to disrupt the plot (have to allow for the finale in the next adventure) but taking out Orcus' right hand ghoul may be satisfying. Includes a skill challenge for crossing a portion of the Abyss For environments, City refers to Sigil.