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.

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 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

Wicked forces conspire to usurp the power of the Raven Queen, god of death, by unraveling the foundations of reality. To prevent this cosmic coup, mighty heroes must survive an epic journey into the Shadowfell's timeless core, where all things find their end. The beginning of the end of the original 4th edition adventure path (although ties are very light to the heroic and elite tier adventures). The PCs must first prove themselves worthy to act as the Raven Queen's agents. They will then be sent to Death's Reach, a graveyard and dumping ground from the Dawn's War. There, they must fight through the Black Star Host- powerful elemental beings, to prevent Orcus was resurrecting a primordial, Timesus the Black Star. One notable encounter is a random encounter with the Worm of Ages. This huge worm has the ability to swallow and rules for moving creatures from its maw to its throat, gullet, and into the stomach.

In the ruins of Kiris Dahn, a human town, lies a 'Slaying Stone'. The stone is said to have the power to kill any foe, though the stone is consumed in the process. The party will venture into the ruins which are the home to an assortment of goblins, hobgoblins, and kobolds. However, a mercenary band of orcs have been hired (by a benefactor who is not met in the module) to search the ruins for the Stone, and the party must find it first. The party must use caution and stealth to move through the town without alerting the denizens or the mercenaries while searching strategic points around the abandoned town to find the Stone. Eventually, the party should find the stone under the protection of an indifferent Brass Dragon.

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 group of snaketongue cultists has occupied an abandoned, partially sunken temple near a swamp. They grow impatient waiting for their yuan-ti master to join them, unaware that he has been slain by a rival faction of yuan-ti. Frustrated, the cult strikes against nearby villages in the hope of drawing the favor of Zehir. Investigating rumors of a serpent cult harassing a nearby town, the PCs have explored the swamp and discovered the overgrown temple. Its once-ornate stone door now hangs off its hinges, providing a narrow space for one character at a time to squeeze through. Pgs. 42-47

The Adventurers arrive at a drow outpost in the Underdark. They must either dispose of the drow or ally with them against the invading legions of Orcus!

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

Will the adventurers be able to thwart the machinations of a mad dragon in the hopes of saving the city of Sharn from certain destruction? Is the slinky elven maiden really in trouble or working for the enemy? Is the body in the morgue really the center of this whole puzzle or merely one piece? This adventure, in the style of a Dashiell Hammett novel, will certainly test their skill and resolve. This is the first full adventure for Eberron with the 4th edition D&D(R) rules. This adventure builds on the sample adventure provided in the Eberron Campaign Guide but is also playable as a stand-alone adventure.

On the outskirts of town lies an ancient temple to an unknown deity. Periodically, undead creatures issue from the catacombs beneath it. The party receives a commission from the city elders to venture into the catacombs and exterminate the undead. Pgs. 64-71

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.

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

"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

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.

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.

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 entity known as Oreiax is a gruesome, stunted monstrosity born of ancient death. Rescued from an eternity of petrification by Doresain the Ghoul King, Oreiax immediately pledged itself to the Ghoul King's service, and thus indirectly, into Orcus's service. Oreiax, born of stone and death, seeks to glorify Doresain by petrifying the world. Pgs. 112-119

“The Shadow Rift of Umbraforge” is a sequel to “Siege of Bordrin’s Watch” and the third part of the Scales of War Adventure Path. In “Siege of Bordrin’s Watch,” the PCs discovered that dark creepers had sold arms and tactical intelligence to the orc war chief Tusk, aiding him in his attack against the folk of the Stonehome Mountains. In this adventure, the PCs investigate the link between the orcs and the dark ones, stumbling into an armsrunning operation that takes them to the Shadowfell in order to finally confront the charismatic figure behind it. Pgs. 4-53

Centuries ago, the four deities worshipped by mortals – Kishar, Kotaresh, Lyth, and Asar-Segt – threatened to drown the world in a flood of saltwater to punish the living for their impiety. The oracles and witches of the realm struck a desperate bargain with the gods, however, and convinced them to spare the world. In exchange, the mortal kingdoms were bound to demonstrate their faith once every generation by sending their most courageous and adroit warriors to the Crucible, a ziggurat in the lowest valley of the land. Every quarter-century, on the first full moon of summer, an eclipse darkens the night and the sealed ziggurat opens. Many traps, tricks, and guardians lie within the Crucible to test those who enter. Few who heed the challenge of the gods survive – most find only quick death. If the races of the world are deserving of the gods’ affection, their champions will overcome the trials of the Crucible and light the Divine Brazier hidden in its uppermost chamber. If they are not, the flickering candle of civilization will be snuffed. Little of value will have been lost. Published by Defy Danger and Save Versus Death