Achtung! Cthulhu 2d20: Gamemaster's Guide

Command the Secret War. Unleash the Mythos.

Enter a world where World War II rages not just on the battlefield—but in the shadows. In Achtung! Cthulhu 2d20: Gamemaster’s Guide, you are the architect of high-stakes missions and cosmic horror. Craft tales of pulp-fueled action, unholy rituals, and unimaginable terror as Allied agents clash with the occult forces of the Third Reich.

This essential guide empowers you to run thrilling campaigns in the Secret War—where the Cult of the Black Sun manipulates Mythos horrors with dark magic, and Nachtwölfe deploy Atlantean tech and twisted science. You’ll bring to life terrifying threats, inspire heroic sacrifice, and shape the fates of those who dare to defy the darkness.

Requires the Achtung! Cthulhu 2d20 Player's Guide to play.

Product Info

• System: Achtung! Cthulhu – 2d20 System

• Publisher: Modiphius Entertainment

• Format: Hardcover or PDF (varies)

• Genre: WWII / Cosmic Horror / Pulp Adventure

• Recommended Age: 14+

Features

• Fully supports the 2d20 System tailored for action-horror gameplay

• Provides tools, tips, and narrative guidance for gamemasters of all levels

• Explores the Nazi occult factions, their tech, magic, and motivations

• Packed with adventure hooks, enemy stat blocks, and world lore

• Guides you in running cinematic missions with Mythos dread and wartime grit

• Built for immersive campaigns with high tension, sanity tests, and bold heroism

Why You’ll Love It

The Achtung! Cthulhu 2d20: Gamemaster’s Guide is your key to unleashing epic, terrifying adventures where bravery meets madness. Whether you're orchestrating desperate last stands or unearthing forbidden lore beneath ruined cities, this book gives you everything to turn your table into a cinematic war against the dark.
The Secret War is calling — will your players survive the horrors you unleash?