From publisher blurb:
Mythras Imperative is a 32 page introduction to the Mythras system, designed for both newcomers and old hands. It gives you a pared-down, simplified version of Mythras but still with enough options and depth to be a playable game. The rules cover character creation, skills, the core mechanics of the game, spot rules for different circumstances, combat mechanics, and several creatures from fantasy, real life and science fiction.
Is this a fantasy game?
We’ve made Mythras Imperative generic. Skills cover the ancient, modern and futuristic settings, and the weapons include firearms. So Mythras Imperative gives you the starting point for adventuring in any time period you want. Other supplements, and the core Mythras rules themselves, expand on things like magic, vehicles, psionic powers and so on.