"Den of the Rotten Kings" is a wererat lair suitable for four 3rd-level characters. This adventure can be completed in one session.

A powerful evil plots to corrupt the fey audience attending a theatrical performance. Her priests pose as convincing performers who set the stage for their master’s arrival in the final act. While staying in the fey community and perhaps as partial reward for some previous accomplishment, the party is invited to the performance. In this dramatic and deadly adventure, the party witnesses a strange performance and the corruption of the fey audience before defeating a herald of darkness and her priests.

While traveling through a jungle expanse, the party meet a trader named Smera with a strange tale. Turned away from a nearby outpost, the trader is now heading back to civilization. Curiosity leads the party to the outpost, which has been destroyed. A strange disease has taken the outpost’s inhabitants, who built the place in support of a scholarly excavation of a nearby temple ruin. Following the path carved through the jungle by the excavation team, the PCs find the temple and its secrets. In this moss-covered and dark adventure, the party explores an old temple, faces its verdant guardians, and finds the source of the strange disease.

"Temple of the Deep Ones" is the lair of a group of deep ones and their god, suitable for four or five 7th-level characters. This adventure can be finished in one session. Ship captains report that a mysterious island has surfaced in the middle of a heavily trafficked trade route. Worse, ships that venture too close to the island are assaulted by a terrible creature and its servants. The island is disrupting trade throughout this part of the world, and several ships have already been lost. Unbeknownst to those that know of the place, the island rises at the will of Shar-Ngolyeth, a long-lost deity also known as That Which Lurks Beneath the Waves. The island is populated by a cult of deep ones and the beasts they have subjugated in the name of their dark god. The creature responsible for sinking ships is an aspect of Shar-Ngolyeth, a kraken. It is not meant for combat encounters; it's largely a plot device in this encounter.

In the thriving city of Zobeck, a breakdown of the vital Puffing Bridge is throwing a wrench into the entire city. Workers can’t reach their jobs, merchants and goods can’t reach markets. In short, if this problem isn’t fixed quickly, there’ll be chaos in the Free City. Of course, this isn’t a simple mechanical breakdown but an act of sabotage, and the saboteurs are still at work when characters arrive to investigate.

Fight the Monster in its Den … If You Dare! Book of Lairs brings you 24 great monster lairs for 5th edition! Each of these exciting and unusual battlegrounds comes with a complete short adventure, including a hook, area hazards, tactics, and treasures. Stage your 5th Edition fights in unforgettable locations like: Alchemist’s Guildhall Necromancer’s Cistern Clockwork Tower Den of the Rotten Kings Lost Halls of Everforge A Pirate Cove Crypt of the Warlock Citadel of the Void Dragon A Dark Grove Lost Fane of the Serpents Branches of Yggdrasil Tomb of the Scorpion Prince Sky Stairs of Beldestan Imperial Ghoul Outpost Umbral Vampire Lair And 10 more! Designed by some of the top names in the RPG industry, Book of Lairs is sure to add an aura of wonder and mystery to your game! Book of Lairs uses standard monsters as well as surprising new creatures from Tome of Beasts, and both monster books are required for maximum playability.

Lo! The corpse of poor, departed Scholar Zubayr, washed up on the shores of the River of Sand, lies in the charnel house…destined to become dinner for a cult of cannibals. Though distasteful in the extreme, this isn’t your concern—except that Princess Karima Gamila, the most beautiful gnoll in Per-Bastet, has begged you to rescue her friend’s body and help discover his fate. Still unmoved to action? Know then, adventurer, that the Scholar was hot on the trail of lost treasure! If you can claim his body from the cult and decipher the clues he left behind, long-buried riches and powerful magic might be yours. But nothing is simple in this city of dark wonders: others converge on the charnel house in pursuit of wealth, vengeance, or both. Can you out-fight and outwit vile cultists, undead catfolk, a cunning werecrocodile gnoll, and the deadly secrets that lie buried beneath the River of Sand? Set in the city of Per-Bastet in the Southlands Campaign Setting, it is meant for play either as the thrilling sequel to Cat and Mouse, or as a standalone treasure hunt! Also available in Pathfinder format.

Navigate court intrigue in the Shadow Fey realm to save the city of Zobeck. Earn status in the court through duels, quests, and negotiation to survive the machinations of factions and nobles to gain freedom for the city of Zobeck from the King and Queen of the Shadow Fey. Also available in 5e format.

"The Hive" is a spawn of Arbeyach lair, also featuring giant termites and termite swarms, for five 6th-level characters. This adventure can be finished in one session. Several mounds in the Forsaken Hills are the dens of voracious termites that have added flesh to their diet to supplement dwindling wood supplies. At night, swarms of termites hunt and devour prey. They swarm over victims in wooden carts and wagons, and bring the dismantled wood back to their mounds. Three spawn of Arbeyach, searching for a location to summon Ia'Affrat, Arbeyach's herald, discovered a mound filled with particularity nasty termites and used their vermin empathy to gain acceptance. They dug out a cavern beneath the mound, and now use the termites to protect themselves and gather food while they complete a difficult ritual involving dozens of sacrifices. The final sacrifice is prepared and the spawn are finishing their ritual when the party arrives.

The spire has existed for as long as locals can remember. Rising above the sand near the ocean, the spire is topped by a natural cave system. Stories about the place circulate around the docks and taverns of the nearby towns—dark tales of ritual sacrifice and the worship of long dead gods of lightning and storm. Many claim the victims of the old cult still crawl through the tunnels accessible at the peak of the spire. Others say a new scaly threat now lairs there, and the storms of late have been most violent near that place. In this explorative and perilous adventure, the party ascends a great rocky spire to face the place’s past and the blue dragon that presently resides there.

The Vault of Pallon the Pious is an adventure for four 2nd level PCs. A famous pirate captain came to worship a lawful god in his final years. After a lifetime of plundering, pillaging, scuttling, and murdering along the coastline, the fear-inspiring Pallon the Merciless rebranded himself as Pallon the Pious. But, a history of violence is a hard thing to reconcile, and the salty old dog slowly succumbed to madness. His most precious possession was a set of scales that reflected perfectly his own inner conflict. The Scales of Misjudgement are buried deep in the treasure room of his crazed rock-island vault.

"A Triangle in Shadows" is an umbral vampire lair suitable for a party of four 15th-level characters. Magic weapons are highly advised. This adventure can be completed in one session. The City Fallen into Shadow is the domain of the fiendish umbral vampires, and they are rarely found outside it. But one named Caragorn has fled the city after coming between the lovers Philadon and Zenobia. Philadon and Caragor, however, are secretly meeting at Caragorn's tower behind Zenobia's back. Zenobia suspects them of collusion, and is seeking out the two male umbral vampires to get revenge.

In the small hamlet of Riverbend, the miller’s wife is missing, and the locals suspect the husband himself was involved. But all is far from what it seems. Ellessandra, the missing woman, is actually an elf from the Summer Lands. She came to live in the human settlement when the miller made a dangerous pact with the River King, the lands’ powerful sidhe ruler. Now, the player characters must unravel the truth behind Ellessandra’s disappearance, piece together the involvement of a young fey lord, and dive into the fey courts of the Summer Lands to stop a raid that would surely spell Riverbend’s doom. All the while, Arthurian intrigue and mischief runs high among the fey lords and ladies in this mercurial, open‑format adventure from acclaimed adventure designer Wolfgang Baur!

The Claret Wellspring is an adventure for four 4th-5th level PCs. "The first spell cast has not yet finished its work." Strange lights in the desert lead the PCs to a long-forgotten oasis. Travelling towards the lights, the PCs are threatened by magic so old, it defies categorization. Arriving at the withered shore of a blood-colored pool, the PCs discover an ancient dial and three tooth-like columns rising from the ground. Turning the dial results in the water being magically siphoned into the column's hollow cavities. If the pool is emptied, a small door is revealed in the crimson-stained much. They must defeat a blood-infused water elemental before proceeding. Once inside, the PCs share a room with a dark ritual running since the origin of the world. The keeper of the place, an immortal fey inside a powerful suit of armor, offers little explanation as to the nature of the ritual, and he seeks to ensure they tell no one of the Claret Wellspring.

The party arrange for passage on a fast ship called the Silver Slipper. The good Captain Sara agrees to take them aboard for a reasonable fee. The voyage, however, is marred by strange events, and the crew begin whispering about a dark statue taken aboard as cargo. The statue is to be delivered to a port beyond the PCs' destination. When a fog rolls in one night, the ship is attacked by evil agents of a dark god come to claim the statue. In this nautical nightmare, the PCs must travel aboard the ship, interact with the crew, and save themselves from a boarding party of eldritch evil.

Multiple groups seek a thug’s girlfriend through the streets and alleys of Zobeck. The adventurers’ lives may depend on finding her first.

A serpentine lamia lair suitable for four or five 4th-level characters. A matriarch lamia leads a large consortium of merchants from a distance and through intermediaries. However, she has recently descended into the common madness of her kind and set up a 'celebration' at an abandoned mine for her consortium and their guards. Will you survive the party?

"I was taken by the evil dogs while camping near Agav's bog. They dragged me into their lair, and it wasn't until I escaped that I knew the truth of the place: a great and bony wing buried in the side of a hill. They chained me in the dark with a candle made from foul wax and forced me to dig at the marrow. Their bonds were poorly made, and I fled several days later while they slept. What purpose did they have in mining that marrow? I cannot say..." The Marrow Mines are dug in and around the fossilized wing of an unnamed leviathan. A small pack of kobolds lives and works in the mines, which are heavily trapped. The kobolds defend the area fiercely and patrol the region around the mine. At night, a handful of urds make aerial surveys of the territory. The urds live in the deep reaches of the wing's tips.

An ancient palace constructed by the mighty Wind Lord Boreas has a new master: the gnoll sorcerous matriarch Odjanbago and her clan—the Archthieves. With the flying Sky Palace at her command, Odjanbago’s legendary clan of thieves and killers have cast a shadow of fear over the Southlands’ northwestern desert. All tremble in fear of the Archthieves, from the jinnborn tribes of the Dominion of the Wind Lords to the priests of Bastet in Nuria Natal. Even lords of Midgard’s Seven Cities grow uneasy at their mention. Whether they hail from the Southlands or elsewhere in Midgard, the PCs must shoulder the responsibility of ending Odjanbago’s reign of terror.

"The Riverfront Rat Gang" is a ratfolk lair, also featuring wharflings and a doppelrat, designed for five 1st level characters. This adventure can be completed in one session. The old dockyards once served as the primary center of commerce in town. Years ago, political pressure from an influential merchant who wanted the docks to be loser to her business forced shipping concerns to move their docks upriver. The new facility accommodates larger ships, and the old docks fell into disuse. Talk of converting the property into a set of riverside shops died when a rat infestation proved to be an unsolvable problem. Thus, the old dockyards have been decaying for years. This situation suited a former thieves' guild member, a ratfolk rogue, named Matimer Creel. A botched robbery (for which Matimer blamed his accomplice) turned the guild against Matimer, who fled from certain death at the hands of the guild master. He hid out in the old dockyards, confident that not even guild members bothered to go there. From there he began to exact revenge against the guild by ruining its plans or stealing directly from it. He also befriended the rat population, thanks to a golden rat's tooth he acquired, and the vermin help with his schemes. A trio of rat-like wharflings and a doppelrat, washed up on the riverbank near the docks, have joined Matimer's retinue.