2021 · ソースブック（プレイを拡張するルール／オプション）

Achtung! Cthulhu Gamemaster's Guide

A gamemaster’s guide for running pulp‑era campaigns that blend World War II espionage with Lovecraftian cosmic horror. It provides advice on running games, designing adventures and campaigns, managing resources and player progression, and creating memorable NPCs and scenarios. Extensive faction dossiers detail rival organisations—Allied agencies, Nazi occult groups, and nonhuman powers—covering history, hierarchy, bases and objectives. The book also collects forbidden lore and ritual magic, new mythos tomes, profiles and stats for major characters, a bestiary of monsters and gods, and equipment lists including experimental weapons and espionage devices.

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