The Design Mechanism produces and publishes the Mythras roleplaying game, the acclaimed and innovative percentile system. Mythras is supported by an extensive range of supplements and adventures, featuring everything from Sword & Sorcery to Science Fiction and Urban Fantasy Horror

Mythras Core Rules

This is the full rulebook, containing everything you need for fantasy adventures.

  • Character Creation
  • Equipment
  • Skills
  • Combat
  • Magic
  • Cults & Brotherhoods
  • Creatures

Mythras Imperative

A free introduction to the Mythras system, and geared towards generic adventures. Mythras Imperative contains basic character creation and combat, introduces the core concepts of the game and gets you adventuring straight away. The ideal gateway to Mythras. 

Just click on the cover to download your free copy!