Radiant Dragon

(From 3.5e Draconomicon: The Book of Dragons - 2003):

Radiant dragons are simultaneously wonderful and terrible, awesome in their righteousness and fearsome in their dedication to destroying evil. 

A radiant dragon seems to shine with a heavenly glow, though it can douse this brightness as desired. If you can bear to look upon its grandeur, you can make out that its perfectly shaped scales glisten like molten white gold. Its proud, regal bearing is unmistakable, and its voice rings like heavenly thunder. 

Radiant dragons prefer lairs that allow plenty of sunlight, and often place gems and other bright valuables in places where they catch and refract the light, creating marvelous displays of color and radiance. To creatures that display nobility and justice, they are the staunchest of allies, offering succor and healing to any in need. But when faced by those who foster chaos or evil, a radiant dragon becomes a furious whirl of color and light, destroying all who oppose it. 

Radiant dragons speak Common, Celestial, and Draconic.

Combat: A radiant dragon relies on its blinding breath weapon primarily in situations when it wishes to defuse a difficult situation without causing unnecessary injury. Against true enemies it unleashes its force breath and spell-like abilities, showing no mercy to those who do not deserve it. 

Young and older radiant dragons’ natural weapons are treated as magic weapons for the purpose of overcoming damage reduction. 

Breath Weapon (Su): A radiant dragon has two types of breath weapons, a line of force or a cone of light. Creatures caught within the cone must make Fortitude saves or be blinded for 1d6 rounds plus 1 round per age category of the dragon. A successful save means the creature is merely dazzled for the same duration. Sightless creatures are immune to the cone of light breath weapon. 

Dispel Darkness (Su): A juvenile or older radiant dragon automatically dispels any darkness spell (whose level is equal to or less than his age category) within 60 feet. 

Healing Touch (Su): An old or older radiant dragon can generate any one of the following effects with its touch: cure critical wounds, regenerate, remove blindness/deafness, remove disease, remove paralysis, or restoration. It may use its healing touch a number of times per day equal to its age category. 

Spell-Like Abilities: At will—daylight; 3/day—searing light; 1/day—prismatic sphere, sunburst.