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This massive, full-color volume is filled with deep resources just for the Delta Green game master.
THE PAST: details on the world and history of Delta Green.
THE UNNATURAL: details on the Cthulhu Mythos, from monsters to hypergeometry to the Great Old Ones, including rules for creating new threats.
THE SCHISM: deep details on the Delta Green organization itself -- or rather, two different Delta Green groups, not always working to the same ends.
THE OPERA: guidelines for creating scenarios, running campaigns, and customizing the setting.
APPENDICES: a ready-to-play scenario, "The Sentinels of Twilight," a Handler-facing glossary, index, recommended media, sample NPCs to use in any game, rules variants, and more.