Mythras (TM)

Mythras is our flagship, d100 roleplaying system, supported by a wide range of supplements and adventures, covering historical fantasy, traditional dungeon crawling, science fiction, and trans-dimensional adventuring. See the Products page for the complete Mythras line.

Ordering Mythras

The Products page allows you to order your copy of Mythras and all our publications. Buying direct from us always includes a free PDF copy of your purchase.

We also have some great, free downloads on the Downloads page, including the Games Masters' Guide, a full, free adventure, and Firearms.


The forum page gives you access to discussion boards for Design Mechanism projects and products. Do swing by and take a look. If you want to post then you can log in using your favoured Social Networking identity, such as Gmail, facebook or Twitter.

Bookmark Us!

The site will be updated regularly with news on Mythras's development and other Design Mechanism projects, so add us to your Favourites and drop by regularly.