Child of the Sun (3.5e Feat)
From D&D Wiki
 Child of the Sun [Racial]
Exposing evil and embracing good you have mastered the ability to let your inner light shine.
Benefit: Increases the subjects natural Daylight ability to "Improved Daylight" (doubles radius and duration).
Special: As your body becomes more celestial, it is also weaker against the forces of chaos. You take an additional 2 points of damage from chaotic weapons.