The Voyance rune is the most basic and permanent rune given to Shadowhunters at a young age, typically placed on the back of the person's dominant hand. This serves to enhance and focus the Sight, giving the wearer extrasensory perception, allowing the Shadowhunter to see contemporary events beyond their sight, past concealment, such as glamour, and, with training and practice, to identify Downworlders on sight. It also, according to Jace, lends an extra skill with weapons.