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 Hottest Dungeons & Dragons from Hydra Cooperative
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What Ho, Frog Demons

What Ho, Frog Demons


Weighing in at 112 pages of pure Slavic/Vancian/Moorcockian acid fantasy, What Ho, Frog Demons is the fourth stand-alone, mini-sandbox adventure in the Slumbering Ursine Dunes series. Fever-Dreaming Marlinko was an experiment in reforming the city setting book: sloughing off the tedious bits and cranking up the most adventurable qualities. What Ho, Frog Demons is...   [click here for more]
Hydra Cooperative  $12.00

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Misty Isles of the Eld

Misty Isles of the Eld


Come visit the acid fantasy mini-sandbox of the Misty Isles, a hellish pocket plane that's brutally displaced a bucolic paradise. Marvel at its massive grub-ridges, shake at the body horror of its protein vats—and watch as your players dynamically unleash the Anti-Chaos Index through their own in-game actions. Misty Isles of the Eld is a stand-alone sequel to Slumbering Ursine Dunes...   [click here for more]
Hydra Cooperative  $12.00

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Slumbering Ursine Dunes

Slumbering Ursine Dunes


Run, play or splice up 66 pages of mayhem and weirdness in this Slavic mythic-inspired (with an acid fantasy-twist) mini-sandbox for Labyrinth Lord or the well-aged fantasy rpg of your druthers. What You Will Find Inside: • A 25-site pointcrawl of the otherwordly Slumbering Ursine Dunes region. Beyond the big ticket adventure sites you will find along the way...   [click here for more]
Hydra Cooperative  $9.00

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Strange Stars OSR Rule Book

Strange Stars OSR Rule Book


It's the far future, Old Earth is lost and shrouded in legend, and the children of paleo-humanity have long ago populated the stars, branching into new forms and strange cultures. Adventure is measured in light-years! STRANGE STARS is a setting where modern transhuman science fiction meets classic 70s space opera. Now you can explore the STRANGE STARS...   [click here for more]
Hydra Cooperative  $5.55

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Completely Unfathomable (DCC)

Completely Unfathomable (DCC)


COMPLETELY UNFATHOMABLE combines the whole of Jason Sholtis’ (The Dungeon Dozen) 2018 Ennie Award-winning adventure Operation Unfathomable with its new companion volume Odious Uplands, adapted and expanded for the DCC game by Paul Wolfe (Mystic Bull Games, DAMN Magazine). All of the material from the OU Players Guide is included...   [click here for more]
Hydra Cooperative  $20.00

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Fever-Dreaming Marlinko

Fever-Dreaming Marlinko


Visit Marlinko, a borderlands city where life takes a strange fever-dream cast, in this 72-page urban adventure fantasy supplement. Part city-setting, part full-blown adventure, Fever-Dreaming Marlinko is a stand-alone companion to the Slavic acid fantasy weirdness of the Slumbering Ursine Dunes. What you will find inside: Background and hooks for...   [click here for more]
Hydra Cooperative  $9.00

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Mortzengersturm, The Mad Manticore of the Prismatic Peak

Mortzengersturm, The Mad Manticore of the Prismatic Peak


After turning himself into a manticore, the self-style wizard-artiste, Mortzengersturm, moved to the crystalline peak of Mount Geegaw to practice his transformation magic without interference. You've been hired to snatch his most prized artifact, the Whim-Wham Stone--or at least some of its eldritch light. A menagerie of magic hybrids, a self-absorbed vampire, more than a few hippogriffs, and of course,...   [click here for more]
Hydra Cooperative  $7.99

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Odious Uplands

Odious Uplands


SO YOU SURVIVED OPERATION UNFATHOMABLE? The Odious Uplands await! You and your brave companions, fresh from their terrible sojourn into the Underworld emerge into the untamed wilds of Stonespear Province, crushed for an eon beneath towering glaciers until a sudden thaw, and bathed in the dim radiance and ineffable influence of the Chaos Aurora!...   [click here for more]
Hydra Cooperative  $15.00

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Operation Unfathomable

Operation Unfathomable


BEHOLD the Underworld in all its bewildering majesty as titanic Chaos Godlings and their unsavory cults make genocidal war upon each other! SEIZE eldritch artifacts and treasures far above your lowly station! THRILL as you throw the gauntlet of your life into the smug face of the unknowable and embark upon OPERATION UNFATHOMABLE!...   [click here for more]
Hydra Cooperative  $12.00

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Weird Adventures

Weird Adventures


Welcome to the City... The streets are mean--and what lurks beneath them is even meaner. Only the most hard-boiled adventurers make it in this town.  You think you got what it takes? Grab your gun or grimoire and find out. Weird Adventures is a setting where traditional rpg fantasy meets the Pulp era.  It's a world where hobogoblins hop trains, gargoyles...   [click here for more]
Hydra Cooperative  $9.99

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The Hill Cantons Cosmology

The Hill Cantons Cosmology


The gods and cosmic weirdness of the Hill Cantons come alive(ish) in this supplement. Currently only available to backers of the Dunes kickstarter.  ...   [click here for more]
Hydra Cooperative  Pay What You Want

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Ruins & Ronin

Ruins & Ronin


A complete set of rules for playing an old school fantasy game (Swords & Wizardry compatible) in a medieval Japanese-like setting.  What's inside: Unique player classes and races. Japanese-styled weapons, equipment and magic items.  A complete 32-page beastiary of monsters and spirits. Reviews: “What you get is an old school Japanese "flavored" fantasy RPG, where bujin,...   [click here for more]
Hydra Cooperative  $2.00

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Azurth Adventures Digest Issue 1

Azurth Adventures Digest Issue 1


Explore the Land of the Azurth with the Azurth Adventures Digest! This full color premier issue focuses on the Boundless Sea to the west of Azurth and includes: A survey of the Motley Isles, home of notorious pirates, and other islands of interest. Random tables for generating Motley Pirates and their equally colorful captains. Random Boundless Sea encounters. Three NPCs: Captain...   [click here for more]
Hydra Cooperative  $2.50

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By this Poleaxe

By this Poleaxe


By this Poleaxe is a four-page set of rules to allow a GM to run small-scale battles or skirmishes involving 15-120 combatants on each side without miniatures. The rules have been specifically designed to work with Labyrinth Lord or similar well-aged fantasy game. Can also be used in conjunction with By this Axe, a simple set of fantasy miniatures...   [click here for more]
Hydra Cooperative   FREE 

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Fever-Dreaming Marlinko Map Pack

Fever-Dreaming Marlinko Map Pack


Three drop-dead gorgeous isometric city and dungeon maps (separated here as a download) for ease of use with Fever-Dreaming Marlinko.  ...   [click here for more]
Hydra Cooperative   FREE 

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Odious Uplands Map Pack

Odious Uplands Map Pack


For DMs eyes only! The Odious Uplands Map Pack contains the 11 x 17" regional map of Stonespear Province, the players' version of this map, and maps of Fort Enterprise, the Buried Tower of Enlightenment, the Science Fungoid Surface Incursion Research Facility, Glung's Arboreal Laboratory, and the Inn Invisible.  ...   [click here for more]
Hydra Cooperative   FREE 

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Operation Unfathomable Map & Char Sheet

Operation Unfathomable Map & Char Sheet


This free pdf includes the 11" x 17" Operation Unfathomable DM's map by Jez Gordon and the player's map and character sheet by Karl Stjernberg.  FOR USE WITH OPERATION UNFATHOMABLE  ...   [click here for more]
Hydra Cooperative   FREE 

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Operation Unfathomable Players' Guide

Operation Unfathomable Players' Guide


For use with Operation Unfathomable (Swords & Wizardry)! Players: READ THIS BEFORE ENTERING. Inside this handy player-facing accessory you'll find Unfathomable Comics! A semi-painless introduction to the feel of the setting 2 playable species: Underworld Otter and Woolly Neanderthal 2 character classes: the Citizen Lich and the Underworld Ranger Unsavory spells Weird new items A partial, probably...   [click here for more]
Hydra Cooperative  $4.00

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Prison of the Hated Pretender

Prison of the Hated Pretender


A sculpted tower's blank eyes stare down from the lonely in dry hills beyond the last withered turnip fields, the doorway in its eternally screaming mouth beckoning daredevils and foolish fortune hunters.  Haunted, shunned and anathema -- spending a night in The Prison of the Hated Pretender will certainly give you bragging rights in the coast's dusty hamlets, and if the rumors of ancient gold...   [click here for more]
Hydra Cooperative  Pay What You Want

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The Ultraviolet Grasslands - Free Introduction

The Ultraviolet Grasslands - Free Introduction


The Ultraviolet Grasslands (UVG) is a rules-light rpg pointcrawl module inspired by psychedelic heavy metal, the Dying Earth genre, and Oregon Trail games. It takes a group of ‘heroes’ into the depths of a vast and mythic steppe filled with the detritus of time and space and fuzzy riffs. The UVG is for referees, game masters, judges, players, and fans of role-playing games who want to run...   [click here for more]
Hydra Cooperative   FREE 

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