Nimbus of Light( Book of Exalted Deeds, p. 44)
You are cloaked in a radiant light that marks you as a servant of the purest ideals. All who look upon you know without a doubt that you are a champion of good and are favored by the powers of the Upper Planes. The nimbus may take the form of a cloud surrounding your entire body, or it may appear as beams of light around your head.
Good creatures automatically recognize the radiance surrounding you as a sign of your purity and devotion to the powers of good. You gain a +2 circumstance bonus on all Diplomacy and Sense Motive checks made when interacting with good creatures.
Your radiance sheds light as a common lamp: bright light to a radius of 5 feet and shadowy illumination to 10 feet. You can extinguish this radiance at will and reactivate it again as a free action.