Iron Arachne
Tools for procedural generation of content for tabletop role-playing games
Welcome to Iron Arachne!
This site lets you randomly generate content for tabletop role-playing games and other fictional works. I'm always tinkering with it, so come back every so often to see if something new's been added.
My name is Ben, and I'm the author of this site and all of the tools on it. You can find my personal website and blog at benovermyer.com. Sometimes I'll write about what I'm working on for Iron Arachne over there.
Featured Generators
The following are generators that I'm particularly proud of or are unique to this site.
Recent Changes
Showing the 5 most recent change log entries.
Apr. 5th, 2026
Visual overhauls for star systems, planetary generators, and genre styles
- Gave more character to the various genre styles (Sci-Fi, Cyberpunk, Fantasy)
- Added star type configuration to star system generator
- Made planet count configurable for star nation and star system generators
- Added composite star system images
- Improved star shader realism
- Added rings to planets
- Made swamp, jungle, and garden planets more realistic
- Updated how clouds are rendered
- Added more variety to gas giants and volcanic, barren, toxic, ocean, ice, and arid planets
- Added more craters to barren planets
- Fixed shader bug in out-of-bounds numbers
Apr. 4th, 2026
Massive refactor to many systems
- Switched everything to use a custom random number generation system
- Rewrote the treasure system
- Rewrote the dungeon generator
- Rewrote the encounter generator
- Rewrote the character generator
- Added a new system for mutating generated content
- Added a new system for applying tags to generated content and filtering by those tags
- Rewrote the religion generator
- Updated the heraldry generator with many more charges
- Updated the heraldry generator to allow for charges "in chief"
- Rewrote the fantasy family generator
- Added a treasure hoard generator
Oct. 27th, 2025
Refactored the heraldry generator code.
- Tweaked the visual design of some headers to fix overlapping text.
- Reorganized the heraldry generator code for better maintainability.
- Added a ton of unit tests for the heraldry generator.
Sep. 14th, 2025
Revamped the visual design of the site.
- Swapped out the old logo for a new one.
- Made all headers use the new logo font.
- Updated the color scheme to be more in line with the new logo.
- Reorganized the navigation so be more intuitive.
Jul. 15th, 2025
Small updates and fixes.
- Added more detail to music styles.
- Added more unit tests to ensure accuracy.