From Introduction: Welcome to Modern Heroes: Martial Avengers, the sourcebook for Strong and Fast Heroes in the D20 Modern roleplaying game. Within these pages you will find a wealth of new material designed to enhance your roleplaying experience. Underlying these new systems and options is a consideration of both the classes themselves and the dramatic themes they represent. New systems do not make characters any more powerful, but serve to expand and enhance the roleplaying experience by making new options available to players and GMs alike, to enable them to realise their concepts for heroes or villains.