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 Hottest Old-School Revival (OSR), Classic D&D/AD&D from Hydra Cooperative
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 Title    Publisher    Price  
What Ho, Frog Demons - HC04

What Ho, Frog Demons - HC04


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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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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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,...   [click here for more]
Hydra Cooperative  $4.00

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