From the introduction: Heroism. Flying through the air. Leaping tall buildings in a single bound. These are the stuff of SuperHeroic adventures. Vigilance is a d20 game designed to allow players to live this fantasy, rescuing the helpless, encouraging the meek, and standing up against the villainous. Vigilance characters are beyond mortal kin, allowing even veteran d20 players the chance to do things with their characters that they never dreamed possible. This is the world of heroes who strive to protect humanity, and the villains who seek to control the weak: A world that requires constant Vigilance from those who would protect it. User summary: Requires the use of Player's Handbook (D&D 3e).