There are things... things that it were better mankind never knew about. 

Achtung! Cthulhu already contains a huge variety of malign Mythos monstrosities, terrors and abominations but this new grimoire of terror expands on them even further. It also features a brand new section devoted to Invidious Cults and Infernal Sects, detailing the malevolent followers of the old ones.

Inside Horrors of the Secret War you’ll discover a new collection of Animals which can be used as familiars, companions and even mounts. Perhaps your agents have always wanted a pet monkey, or to terrify their enemies by charging into battle on a war elephant!

The Creatures of Weird Science and Sinister Sorcery section details new individuals, units and entities directly involved in the Secret War. Some, like Pork Chop or Headless Harry, are allies from Section M and Majestic, but others like Black Sun’s Zaubererjäger or Nachtwölfe’s fearsome Juggernaut make powerful new adversaries.

The Horrors and Monstrosities section presents a selection of creatures to threaten both body and soul. This includes classic mythos creations like Dholes or Spiders of Leng, plus a range created exclusively for this bestiary like the loathsome Sand Dweller or fiery Seed of Kol’Valassam. This tome of terror concludes with a sanity-challenging selection of Elder Gods, Outer Gods and Great Old Ones, a new pantheon of terrifying deities to strike trepidation into even the stoutest of hearts!

Horrors of the Secret War also features Invidious Cults and Infernal Sects, a chapter showcasing brand new occult organisations to bring further intrigue and added depth to your games. Features pre-made cults from across the globe, plus rules for creating your own cult from scratch, a ready-made cult headquarters and map and adventure seeds for anti-cult missions!

The 100-page, softcover Horrors of the Secret War features:

• Over 75 new creatures, monsters, entities, demons and gods which range from lowly animals to the terrifying gods of the mythos
• Includes classic Cthulhu creatures like the Hunting Horror
• Many new and unique monsters and monstrosities
• A wealth of new cults who worship the deities of the Mythos and oppose them
• Rules for generating a unique cult, plus a full colour HQ map and mission seeds

Requires the Achtung! Cthulhu 2d20 core books to run.