Introduction Phobos is a fast, simple, free role-playing game system, with a universal task system based on result qualities and one twenty-sided die. Phobos is intended for modern fantasy/horror, and has its own specific game world in the Phobos GM Book. While Phobos is not a completely universal system, it can be used for a wide range of alternative settings, including the very strange world of my multiplayer computer game Techies, or for any fairly realistic or gritty genre; low fantasy, science fiction, and film noir are easily done with it, while action-movie, high fantasy, swashbuckling, and superheroics would require some extensive modifications to the magic and combat systems.