Lumen is a rare Legacy which has many functions. Development begins with an unbearable burning sensation in the palms brought on by an imbalance of emotion, such as anger or excitement. Along with the burning, Lumen comes in the form of light emitted from the palms, a continuing and useful function in the dark. As the development continues, it allows resistance to heat throughout the body, though the spread of heat resistence is aided with the Lorien Crystal.
- The I Am Number Four movie portrays the Lumen being able to power up the Loric when they have been weakened. None of the books mention this property.
- In Latin, Lumen means "Light"
- Lumen may lead to Pyrokinesis.