# Fantasy Grounds \- Call of Cthulhu: Canis Mysterium

Summer DB entity ID: f83a7b19\-1fd6\-41e2\-9e5c\-719465f24691

Steam App ID: 415540

Constable Clark of Coldwater Falls, was desperate for attention\. He'd been in touch with every sanatorium and hospital from New York to Boston and there's not an empty bed to be found since the stock market crash of last year\. They're full to brimming with suicidal businessmen and investors\. He is holding a man in his jail exhibiting some rather extraordinary behaviors\. The delusion is complete and total\-\-he walks on all fours and he won't speak a word\. They say he even eats out of a bowl and refuses utensils\! Not a shred of human behavior left in him\.   The man attacked a young girl before he was discovered\. He was found\.\.\.well\.\.\.gnawing on part of her leg\!   Canis Mysterium  is an adventure scenario for the Call of Cthulhu roleplaying system, designed to be played in one or more gaming sessions\. This scenario is suitable as an introduction to a new campaign or can easily be worked into an established storyline\. As written, this adventure is set in and near Arkham of October of 1930, making Chaosium's H\.P\. Lovecraft's Arkham supplement particularly helpful\. Several scenario seeds are offered to keepers who wish to expand and continue the events in this adventure, perhaps giving birth to a new campaign or providing handy subplot sessions to pre\-existing campaigns\. By Scott Haartman with Nilla, York, and Mclean  Requires:  Call of Cthulhu ruleset  Converted by:   Colin Richardson  Adapted for Fantasy Grounds by:      Requires:  The free Fantasy Grounds virtual tabletop \(VTT\) software and a one time purchase of the Call of Cthulhu ruleset\. Screenshots may differ from what you see in\-game based on the extension and ruleset you have loaded\.

## Game information

- Type: dlc

- Developer: SmiteWorks USA, LLC

- Publisher: Smiteworks USA, LLC

- Release date: Oct 29, 2015

- Coming soon: false

- Free to play: false

- Parent Steam app: 252690

- Genres: Indie, RPG, Strategy

- Categories: Multi\-player, Online PvP, LAN PvP, Shared/Split Screen PvP, Co\-op, Shared/Split Screen, Cross\-Platform Multiplayer, Downloadable Content, Remote Play Together, Family Sharing

- Platforms: windows, mac

- Website: Not collected

- Screenshots: https://shared\.akamai\.steamstatic\.com/store\_item\_assets/steam/apps/415540/ss\_2a84a977332c7fa1243bb18c9ae95b86012a84a1\.1920x1080\.jpg?t=1782863054

- Price: 599 minor units USD; discount 0%

- Price country: US

## Observed metrics

- Current players: Not collected

- Steam review count: 0

- Steam positive reviews: 0

- Steam negative reviews: 0

- Steam positive percentage: Not collected

- Summer DB rating: No native votes

Review filters: \{"language":"all","review\_type":"all","purchase\_type":"all","filter\_offtopic\_activity":0\}

## Player history

[Seven-day chart data as Markdown](/api/v1/entities/f83a7b19-1fd6-41e2-9e5c-719465f24691/player-metrics?days=7&format=markdown) · [JSON](/api/v1/entities/f83a7b19-1fd6-41e2-9e5c-719465f24691/player-metrics?days=7)

Chart values are hourly observed maxima. The sampled 24-hour peak and missing intervals carry explicit coverage; history before collection is unknown.

## Sources and freshness

- Catalog membership: store\_catalog

- Catalog observed: 2026\-09\-28T16:58:32\.455488\+00:00

- Details observed: 2026\-09\-22T07:49:51\.503837\+00:00

- Player count observed: Not collected

- Reviews observed: 2026\-09\-22T07:49:53\.515893\+00:00

Full provenance: \{"urls":\{"price":"https://store\.steampowered\.com/app/415540/","catalog":"https://api\.steampowered\.com/IStoreService/GetAppList/v1/","details":"https://store\.steampowered\.com/app/415540/","players":null,"reviews":"https://store\.steampowered\.com/appreviews/415540"\},"price":"2026\-09\-22T07:49:51\.503837\+00:00","source":"steam","catalog":"2026\-09\-28T16:58:32\.455488\+00:00","country":"US","details":"2026\-09\-22T07:49:51\.503837\+00:00","players":null,"reviews":"2026\-09\-22T07:49:53\.515893\+00:00","language":"en","editorial":null,"membership":"store\_catalog","observations":\{"price":"56740b61\-75c9\-4c1d\-a88a\-a0d26f7f32b9","catalog":"ac9a35d7\-173c\-4c53\-83ad\-dfcfba01386e","details":"beaa0949\-fe8c\-4f2e\-949b\-b5601f4c1e06","players":null,"reviews":"72e34c85\-11b8\-4667\-8a25\-2300690e0424"\},"reviewFilters":\{"language":"all","review\_type":"all","purchase\_type":"all","filter\_offtopic\_activity":0\}\}

Native rating methodology: \{"count":0,"average":null,"entityId":"f83a7b19\-1fd6\-41e2\-9e5c\-719465f24691","revision":0,"observedAt":null,"methodology":"arithmetic\-v1","distribution":\[0,0,0,0,0,0,0,0,0,0\]\}

Steam reviews are not Summer DB votes. Missing data is not zero. Player counts are observations, not historical peaks. A supplemental record does not establish that a game was delisted.

[Steam store](https://store.steampowered.com/app/415540/) · [JSON](/api/v1/games/f83a7b19-1fd6-41e2-9e5c-719465f24691)