Campaign framework
A fully realized federal agency with history, org chart, SecurStore logistics, and a Committee of Seven — ready to anchor a full campaign.
Division 13: Guardians of the Unknown
The government knows monsters are real. Division 13 is the unit no one talks about — and the only thing standing between the public and the truth.
Established by order of President Zachary Taylor in 1850, Division 13 operates under the Department of the Interior with a black budget, a governing Committee of Seven, and a mandate to eliminate or neutralize threats that conventional law enforcement can't explain and the public can't know about.
This supplement gives Keepers a fully realized framework for modern federal horror — complete with organizational structure, surveillance gear, specialized weapons, and a ready-to-run introductory mission that drops agents straight into something that should not exist.
Instant immersion
Mission briefs, agency IDs, surveillance tools, and classified handouts make agents feel like they're actually on the job.
Play-ready adventure
"The Secrets Within: Locker 146" is a complete introductory mission with live mythos threats and real consequences.
Six pre-generated agents
A forensic pathologist, detective, occult professor, photographer, astrophysicist, and hacker — ready to deploy.
A dead agent's private locker. A cleaning crew operation. Nothing about this job should be complicated — until the door swings open.
The government's best-kept secret since 1850
Division 13 was born from President Taylor's encounter with mythos creatures during the Mexican-American War — rubbery black beasts that swooped from the sky and carried men to their deaths. Surviving that encounter convinced him that conventional methods were useless against such threats. One year after the Department of the Interior was established, Division 13 followed.
Today the division runs approximately 30 active field agents — kept low by high attrition rates — operating in teams of five under four Assistant Directors covering West, Central, East, and Special Operations. Agents are recruited from federal agencies across the board: Homeland Security, Secret Service, DEA, ATF, IRS Criminal Investigation, and the US Marshals. Once you're in, you don't talk about it.
The mission: Locker 146
Cleaning Crew Operation
Former Division 13 agent Wilson P. Hammersmith has died. His private SecurStore locker in Keene, NH needs to be inventoried, cleared, and secured before his family gets anywhere near it.
345 Johnston Ave, Brattleboro VT
Locate Hammersmith's SecurStore keycard, secure any Division 13 materials — weapons, badges, classified sit-reps — and get out without alerting the neighbor or the family en route.
SecurStore, Keene NH
A 20-by-40-foot secured storage unit. Reinforced door. RFID lock. A stainless steel dissection table at the center. An orange glow from the far end. And something moving on the table.
The Rat-Thing
Pinned to the dissection tray, feigning death, waiting. It will plead to be freed — and what it offers in return depends entirely on how the agents handle it.
The Flame Vampire
Trapped inside a perpetual lantern removed from an Italian tomb in 1975. It wants out. If it gets out during the wrong season, it won't be alone for long.
Play-ready package
Full supplement, complete mission, six pre-gens, five handouts, locker and apartment maps, firearms appendix, and full surveillance gear catalog.
What keepers get
Full organizational framework
Director, four Assistant Directors, supervisory agents, field teams, support section, and a Committee of Seven with named members — historical and current.
SecurStore system
Division 13's secure storage network explained in full — how it works, what's in it, how agents access it, and why it doubles as an untraceable slush fund.
Surveillance toolkit
Bug detectors, covert pen recorders, CanCam, key cameras, button cameras, digital binoculars, the Draganflyer X UAV, and a portable multi-channel recording system.
Specialized firearms
Agency sidearms, submachine guns, automatic rifles, sniper rifles, a Two-Bore 34mm rifle mortar, and the XM-25 grenade launcher — with full stats and keeper notes.
Mission history
Grand Canyon serpent folk (1892), Devils Reef (1959), the NYC sewer explosion (2014), and the Serpent Mounds operation (2020) — a living world with an active caseload.
Modular by design
The framework slots into any modern Call of Cthulhu campaign. Run Locker 146 as a one-shot introduction or use Division 13 as the backbone of an ongoing series.
Inside the book
The Supplement
- Founding history of Division 13 (1850–present)
- Full organizational chart with named personnel
- Committee of Seven — historical and current membership
- SecurStore network overview and logistics
The Mission
- "The Secrets Within: Locker 146" — complete adventure
- Apartment search and locker entry sequences
- Rat-Thing and Flame Vampire — full stats and keeper notes
- Rewards, consequences, and aftermath guidance
Handouts & Maps
- Handout 1: Secure mission brief email
- Handout 2: Photo of Wilson P. Hammersmith
- Handout 3/3a: Apartment map and layout
- Handout 4/4a: Locker 146 map and layout
Appendices
- Appendix 1: Full organizational chart
- Appendix 2: Complete firearms catalog with stats
- Appendix 3: Full surveillance equipment catalog
- Six pre-generated agents with full backstories
Who this is for
- Keepers who want a modern, grounded framework that justifies why investigators keep getting involved in mythos cases.
- Groups that enjoy procedural, mission-based play with real operational detail.
- Tables looking for a one-shot entry point that opens the door to a full federal horror campaign.
- Players who want to feel like professionals — not lucky bystanders — when the impossible shows up.
Content note: This supplement contains themes of government conspiracy, body horror, cosmic dread, and violence. The included mission features mythos creatures with lethal and sanity-threatening abilities. Intended for mature players and Keepers comfortable with modern horror.
The monsters are real. Division 13 is the only thing between them and everyone else.
Division 13: Guardians of the Unknown gives you a complete modern Call of Cthulhu framework — a secret federal agency, a century of operational history, a ready-to-run mission, and everything you need to make your agents feel the weight of the job.