"Rise Up Against the Gods Themselves!" Welcome to an epic struggle of heroic mortals pitting blade, spear, and bow against the claws and tentacles of eldritch horrors from beyond the stars. These Hidden Wars in the shadows of ancient Rome...

"Control the Course of the Hidden Wars" Take your place as a gamemaster of a dark epic RPG set in an age of world-shaking heroes and villains vying to protect or corrupt humanity. This is a setting rife with brutal...

Petersen Games announces Nightmares I! Supercharge your epic 5e campaign with the terrifying fun of monsters connected to the Cthulhu Mythos! A Bghaggua, a Martian Cat, and a Siege-Claw Therizinosaurus walk into a bar. Don’t get the punchline? Meet these...

Tiarazan’s reprieve from the machinations of the King in Yellow proved short-lived, as their ultimate purpose became evident, they were the harbinger of an even more powerful, appalling, and unspeakable Great Old One. An intelligence older than the stars, nigh...

Despite their victory, the heroes’ reprieve is short-lived. The Yellow Sign, now emblazoned upon the moon, shines down upon Tiarazan and spreads the vile corruption of the King in Yellow. With each passing hour, the machinations of a young aristocrat...

It began with murder most foul. Two families of prestige, power, and influence. A shadowy group of zealots and an addled troupe of entertainers. At the center of it all, a masked figure intent on bringing a forbidden play, The...

A cursed play from an infamous playwright sows disaster wherever it appears. It has surfaced in the ancient city of Tiarazan to spread its malignant influence like the plague. Enemies seen and unseen oppose the characters and seek to forever...

Sandy Petersen’s Cthulhu Mythos is the most comprehensive guide to including Lovecraftian elements in your Roleplaying game, written by Sandy Petersen, the author of the groundbreaking Call of Cthulhu role-playing game. This massive tome contains over 100 monster stat blocks,...

In the fourth and final Act of Big Sleep, Lullaby, Tsathoggua’s rampage continues unchecked. Your heroes must delve deep into the caverns whence the Great Old One emerged. Here, you encounter ancient subterranean civilizations and primordial beasts. As you make your...

In Act 3: The Fate of the Empire, you and your heroes now seek assistance from the mountain kingdom of Lorenz, but King Leo proves troublesome indeed. He demands your heroes lead an expedition to the cultists’ hollow mountain. Unfortunately, his...

In Act 2: The Doomed World, you and your allies have temporarily escaped some of the worst effects of Tsathoggua’s rising, but now the Great Old One walks the surface world. What do the Sleeper’s demented cultists seek? You follow a...

In Act 1: The Sleeper Rising, you and your fellow heroes are caught between the religious police and a cabal of hidden cultists. Recruited by the king of Axphain, you must begin to root out the cultists. You discover a network...

In the fourth and final Act of Dark Worlds, The Green Pyramid, the time has come at last to take the fight to the dread Mi-Go; the Fungi from Yuggoth. Returning to Yuggoth, you find that the Fungi have not...

The Zepzeg Cycle, you are brought to Yuggoth’s moon Thog, where you learn of the existence of the Zepzeg – a spacefaring alien species in many ways the antithesis of the Mi-Go. Plus, you learn of a lost colony of...

In Nithon, you traverse the Radiation Wastes of Yuggoth, encounter creatures and hazards from nightmare as you seek the Forest and City of Nithon. Here lies the Green Pyramid of the Watcher. The Pyramid awakens before your eyes, and you...

In Dark Worlds, the new Cthulhu Mythos for 5e campaign, You and your friends become unwitting pawns caught up in the blunders of a mad ruler. His insane attempt to curry favor with the dread Fungi from Yuggoth results in...

With their enemies on the defensive, the heroes must try to knock both the Yithians and the Elder Things out of the war. But can they successfully campaign against entities who are wiser and more intelligent than even the smartest...

The heroes are on the offensive, trying to undermine the ancients’ plans, but they can’t do it here – they must travel to the dreamlands to find new allies. But this is not all. Their ally, the mummified cat Dandelion,...