Codex Integrum

Fast. Bloody. Immersive.

Historical Combat & Campaigns for d20


Most of the great advances of the Renaissance were at the end of a long chain of ideas originating in …

Codex Guide to the Mediedval Baltic Vol 2

After 3 years, Codex Guide to the Medieval Baltic Volume II is now available!

To get an idea of how we got here, you can check out the forum post A brief history of …

Albrecht Dürer, St. Eustace There is a lot of online buzz these days about “historical gaming”. Historical games can provide …

Codex Guide to the Medieval Baltic Volume 2

The Baltic, the furthest frontier of medieval Christendom, and one of the most perilous, where violence and the supernatural meet.  …

Codex Superno: Seidr of the Norse

Codex Superno: Seidr of the Norse is a Codex Superno supplement that brings the Seiðr magic of Norse mythology into …

What is Codex Integrum?

Historical Combat

Codex Martialis brings hard core, fast-paced, historical combat to OGL 3.5. Hit the ground running with new options that won’t bog down your game. 

If you want your game to really feel like a fight: this is it.

magic based on Real Medieval sources

Suitable for a medieval historical or fantasy RPG setting, Codex Superno takes you to a place where someone was just as likely to rely on a magic talisman for protection as they were upon steel armor and the edge of a sharp sword.
The world of Copernicus, Albrecht Dürer, and Christine de Pisan was
awakening to reason and the liberating promise of technology, but it was
also a realm of sorcery and the occult.

Prepare if you will to enter the capricious, mystical, syncretic realm of a character you might never have encountered before: the Renaissance Magus.

Just in it for the history?
Discover the Medieval World

The Codex Guide to the Medieval Baltic is a general historical overview of the Baltic region in 1456 AD suitible for use by gamers, historical fencers, re-enactors, military historians, and anyone curious about life in Northeastern Europe 500 years in the past.

You have been to Narnia and Middle Earth, to Cimmmeria and even the hideous plateau of Leng. But you have never been to this place.

If you want to know what the medieval world was really like, this is your ticket to a land that is nothing like what you imagined, and is far more interesting, nuanced and engaging than any fantasy genre you’ve ever explored.

User feedback is encouraged and has a real impact on the development of this project.